.cargo/config.toml

@@ -1,2 +0,0 @@
-[alias]
-dev = ["run", "--", "dev"]

.editorconfig

@@ -0,0 +1,7 @@
+root = true
+
+[*.rs]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4

.github/workflows/rust.yml

@@ -1,47 +1,20 @@
-name: Check
+name: Rustlings Tests
 
 on:
   push:
-    branches: [main]
-    paths-ignore:
-      - website
-      - '*.md'
+    branches: [ main ]
   pull_request:
-    branches: [main]
-    paths-ignore:
-      - website
-      - '*.md'
+    branches: [ main ]
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  clippy:
+  build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - name: Clippy
-        run: cargo clippy -- --deny warnings
-  fmt:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: rustfmt
-        run: cargo fmt --all --check
-  test:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-    steps:
-      - uses: actions/checkout@v4
-      - uses: swatinem/rust-cache@v2
-      - name: cargo test
-        run: cargo test --workspace
-  dev-check:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: swatinem/rust-cache@v2
-      - name: rustlings dev check
-        run: cargo dev check --require-solutions
+    - uses: actions/checkout@v3
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose

.github/workflows/website.yml

@@ -1,43 +0,0 @@
-name: Website
-
-on:
-  workflow_dispatch:
-  push:
-    branches: [main]
-    paths: [website]
-
-jobs:
-  build:
-    defaults:
-      run:
-        working-directory: website
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install TailwindCSS
-        run: npm install
-      - name: Build CSS
-        run: npx @tailwindcss/cli -m -i input.css -o static/main.css
-      - name: Download Zola
-        run: curl -fsSL https://github.com/getzola/zola/releases/download/v0.20.0/zola-v0.20.0-x86_64-unknown-linux-gnu.tar.gz | tar xz
-      - name: Build site
-        run: ./zola build
-      - name: Upload static files as artifact
-        uses: actions/upload-pages-artifact@v3
-        with:
-          path: website/public/
-
-  deploy:
-    needs: build
-    # Grant GITHUB_TOKEN the permissions required to make a Pages deployment
-    permissions:
-      pages: write    # to deploy to Pages
-      id-token: write # to verify the deployment originates from an appropriate source
-    # Deploy to the github-pages environment
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: ubuntu-latest
-    steps:
-      - name: Deploy to GitHub Pages
-        uses: actions/deploy-pages@v4

.gitignore

@@ -1,19 +1,13 @@
-# Cargo
-target/
-Cargo.lock
-!/Cargo.lock
-
-# State file
-.rustlings-state.txt
-
-# OS
-.DS_Store
-.direnv/
-
-# Editor
 *.swp
+target/
+**/*.rs.bk
+.DS_Store
+*.pdb
+exercises/clippy/Cargo.toml
+exercises/clippy/Cargo.lock
+rust-project.json
 .idea
+.vscode/*
+!.vscode/extensions.json
 *.iml
-
-# Ignore file for editors like Helix
-.ignore
+*.o

.gitpod.yml

@@ -0,0 +1,7 @@
+tasks:
+  - init: /workspace/rustlings/install.sh
+    command: /workspace/.cargo/bin/rustlings watch
+
+vscode:
+  extensions:
+    - rust-lang.rust-analyzer@0.3.1348

.replit

@@ -0,0 +1,2 @@
+language = "rust"
+run = "[ -x ~/.cargo/bin/rustlings ] && ~/.cargo/bin/rustlings watch || ./install.sh"

.typos.toml

@@ -1,7 +0,0 @@
-[default.extend-words]
-"earch" = "earch" # Because of <s>earch in the list footer
-
-[files]
-extend-exclude = [
-  "CHANGELOG.md",
-]

.vscode/extensions.json

@@ -0,0 +1,5 @@
+{
+    "recommendations": [
+        "rust-lang.rust-analyzer"
+    ]
+}

AUTHORS.md

@@ -0,0 +1,274 @@
+## Authors
+
+This file lists the people that have contributed to this project.
+
+Excluded from this list are @carols10cents and @diannasoreil, the principal
+authors.
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
+<table>
+  <tbody>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="http://carol-nichols.com"><img src="https://avatars2.githubusercontent.com/u/193874?v=4?s=100" width="100px;" alt="Carol (Nichols &#124;&#124; Goulding)"/><br /><sub><b>Carol (Nichols &#124;&#124; Goulding)</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=carols10cents" title="Code">💻</a> <a href="#content-carols10cents" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://twitter.com/QuietMisdreavus"><img src="https://avatars2.githubusercontent.com/u/5217170?v=4?s=100" width="100px;" alt="QuietMisdreavus"/><br /><sub><b>QuietMisdreavus</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=QuietMisdreavus" title="Code">💻</a> <a href="#content-QuietMisdreavus" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/robertlugg"><img src="https://avatars0.githubusercontent.com/u/6054540?v=4?s=100" width="100px;" alt="Robert M Lugg"/><br /><sub><b>Robert M Lugg</b></sub></a><br /><a href="#content-robertlugg" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://hynek.me/about/"><img src="https://avatars3.githubusercontent.com/u/41240?v=4?s=100" width="100px;" alt="Hynek Schlawack"/><br /><sub><b>Hynek Schlawack</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=hynek" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://spacekookie.de"><img src="https://avatars0.githubusercontent.com/u/7669898?v=4?s=100" width="100px;" alt="Katharina Fey"/><br /><sub><b>Katharina Fey</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=spacekookie" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/lukabavdaz"><img src="https://avatars0.githubusercontent.com/u/9624558?v=4?s=100" width="100px;" alt="lukabavdaz"/><br /><sub><b>lukabavdaz</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=lukabavdaz" title="Code">💻</a> <a href="#content-lukabavdaz" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://vestera.as"><img src="https://avatars2.githubusercontent.com/u/4187449?v=4?s=100" width="100px;" alt="Erik Vesteraas"/><br /><sub><b>Erik Vesteraas</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=evestera" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Delet0r"><img src="https://avatars1.githubusercontent.com/u/23195618?v=4?s=100" width="100px;" alt="delet0r"/><br /><sub><b>delet0r</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=Delet0r" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="http://phinary.ca"><img src="https://avatars1.githubusercontent.com/u/10522375?v=4?s=100" width="100px;" alt="Shaun Bennett"/><br /><sub><b>Shaun Bennett</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=shaunbennett" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/abagshaw"><img src="https://avatars2.githubusercontent.com/u/8594541?v=4?s=100" width="100px;" alt="Andrew Bagshaw"/><br /><sub><b>Andrew Bagshaw</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=abagshaw" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://ai6ua.net/"><img src="https://avatars2.githubusercontent.com/u/175578?v=4?s=100" width="100px;" alt="Kyle Isom"/><br /><sub><b>Kyle Isom</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=kisom" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/ColinPitrat"><img src="https://avatars3.githubusercontent.com/u/1541863?v=4?s=100" width="100px;" alt="Colin Pitrat"/><br /><sub><b>Colin Pitrat</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=ColinPitrat" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://zacanger.com"><img src="https://avatars3.githubusercontent.com/u/12520493?v=4?s=100" width="100px;" alt="Zac Anger"/><br /><sub><b>Zac Anger</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=zacanger" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/mgeier"><img src="https://avatars1.githubusercontent.com/u/705404?v=4?s=100" width="100px;" alt="Matthias Geier"/><br /><sub><b>Matthias Geier</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=mgeier" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/cjpearce"><img src="https://avatars1.githubusercontent.com/u/3453268?v=4?s=100" width="100px;" alt="Chris Pearce"/><br /><sub><b>Chris Pearce</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=cjpearce" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://yvan-sraka.github.io"><img src="https://avatars2.githubusercontent.com/u/705213?v=4?s=100" width="100px;" alt="Yvan Sraka"/><br /><sub><b>Yvan Sraka</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=yvan-sraka" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/dendi239"><img src="https://avatars3.githubusercontent.com/u/16478650?v=4?s=100" width="100px;" alt="Denys Smirnov"/><br /><sub><b>Denys Smirnov</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=dendi239" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/eddyp"><img src="https://avatars2.githubusercontent.com/u/123772?v=4?s=100" width="100px;" alt="eddyp"/><br /><sub><b>eddyp</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=eddyp" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://about.me/BrianKung"><img src="https://avatars1.githubusercontent.com/u/2836167?v=4?s=100" width="100px;" alt="Brian Kung"/><br /><sub><b>Brian Kung</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=briankung" title="Code">💻</a> <a href="#content-briankung" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://rcousineau.gitlab.io"><img src="https://avatars3.githubusercontent.com/u/281039?v=4?s=100" width="100px;" alt="Russell"/><br /><sub><b>Russell</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=miller-time" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://danwilhelm.com"><img src="https://avatars3.githubusercontent.com/u/6137185?v=4?s=100" width="100px;" alt="Dan Wilhelm"/><br /><sub><b>Dan Wilhelm</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=danwilhelm" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Jesse-Cameron"><img src="https://avatars3.githubusercontent.com/u/3723654?v=4?s=100" width="100px;" alt="Jesse"/><br /><sub><b>Jesse</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=Jesse-Cameron" title="Code">💻</a> <a href="#content-Jesse-Cameron" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/MrFroop"><img src="https://avatars3.githubusercontent.com/u/196700?v=4?s=100" width="100px;" alt="Fredrik Jambrén"/><br /><sub><b>Fredrik Jambrén</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=MrFroop" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/petemcfarlane"><img src="https://avatars3.githubusercontent.com/u/3472717?v=4?s=100" width="100px;" alt="Pete McFarlane"/><br /><sub><b>Pete McFarlane</b></sub></a><br /><a href="#content-petemcfarlane" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/nkanderson"><img src="https://avatars0.githubusercontent.com/u/4128825?v=4?s=100" width="100px;" alt="nkanderson"/><br /><sub><b>nkanderson</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=nkanderson" title="Code">💻</a> <a href="#content-nkanderson" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/ajaxm"><img src="https://avatars0.githubusercontent.com/u/13360138?v=4?s=100" width="100px;" alt="Ajax M"/><br /><sub><b>Ajax M</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=ajaxm" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://dylnuge.com"><img src="https://avatars2.githubusercontent.com/u/118624?v=4?s=100" width="100px;" alt="Dylan Nugent"/><br /><sub><b>Dylan Nugent</b></sub></a><br /><a href="#content-Dylnuge" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/vyaslav"><img src="https://avatars0.githubusercontent.com/u/1385427?v=4?s=100" width="100px;" alt="vyaslav"/><br /><sub><b>vyaslav</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=vyaslav" title="Code">💻</a> <a href="#content-vyaslav" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://join.sfxd.org"><img src="https://avatars1.githubusercontent.com/u/17297466?v=4?s=100" width="100px;" alt="George"/><br /><sub><b>George</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=gdoenlen" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/nyxtom"><img src="https://avatars2.githubusercontent.com/u/222763?v=4?s=100" width="100px;" alt="Thomas Holloway"/><br /><sub><b>Thomas Holloway</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=nyxtom" title="Code">💻</a> <a href="#content-nyxtom" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/workingjubilee"><img src="https://avatars1.githubusercontent.com/u/46493976?v=4?s=100" width="100px;" alt="Jubilee"/><br /><sub><b>Jubilee</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=workingjubilee" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/WofWca"><img src="https://avatars1.githubusercontent.com/u/39462442?v=4?s=100" width="100px;" alt="WofWca"/><br /><sub><b>WofWca</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=WofWca" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/jrvidal"><img src="https://avatars0.githubusercontent.com/u/1636604?v=4?s=100" width="100px;" alt="Roberto Vidal"/><br /><sub><b>Roberto Vidal</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=jrvidal" title="Code">💻</a> <a href="https://github.com/rust-lang/rustlings/commits?author=jrvidal" title="Documentation">📖</a> <a href="#ideas-jrvidal" title="Ideas, Planning, & Feedback">🤔</a> <a href="#maintenance-jrvidal" title="Maintenance">🚧</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/jensim"><img src="https://avatars0.githubusercontent.com/u/3663856?v=4?s=100" width="100px;" alt="Jens"/><br /><sub><b>Jens</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=jensim" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://rahatah.me/d"><img src="https://avatars3.githubusercontent.com/u/3174006?v=4?s=100" width="100px;" alt="Rahat Ahmed"/><br /><sub><b>Rahat Ahmed</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=rahatarmanahmed" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/AbdouSeck"><img src="https://avatars2.githubusercontent.com/u/6490055?v=4?s=100" width="100px;" alt="Abdou Seck"/><br /><sub><b>Abdou Seck</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=AbdouSeck" title="Code">💻</a> <a href="#content-AbdouSeck" title="Content">🖋</a> <a href="https://github.com/rust-lang/rustlings/pulls?q=is%3Apr+reviewed-by%3AAbdouSeck" title="Reviewed Pull Requests">👀</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://codehearts.com"><img src="https://avatars0.githubusercontent.com/u/2885412?v=4?s=100" width="100px;" alt="Katie"/><br /><sub><b>Katie</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=codehearts" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Socratides"><img src="https://avatars3.githubusercontent.com/u/27732983?v=4?s=100" width="100px;" alt="Socrates"/><br /><sub><b>Socrates</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=Socratides" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/gnodarse"><img src="https://avatars3.githubusercontent.com/u/46761795?v=4?s=100" width="100px;" alt="gnodarse"/><br /><sub><b>gnodarse</b></sub></a><br /><a href="#content-gnodarse" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/harrisonmetz"><img src="https://avatars1.githubusercontent.com/u/7883408?v=4?s=100" width="100px;" alt="Harrison Metzger"/><br /><sub><b>Harrison Metzger</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=harrisonmetz" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/TorbenJ"><img src="https://avatars2.githubusercontent.com/u/9077102?v=4?s=100" width="100px;" alt="Torben Jonas"/><br /><sub><b>Torben Jonas</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=TorbenJ" title="Code">💻</a> <a href="#content-TorbenJ" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://paulbissex.com/"><img src="https://avatars0.githubusercontent.com/u/641?v=4?s=100" width="100px;" alt="Paul Bissex"/><br /><sub><b>Paul Bissex</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=pbx" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/sjmann"><img src="https://avatars0.githubusercontent.com/u/6589896?v=4?s=100" width="100px;" alt="Steven Mann"/><br /><sub><b>Steven Mann</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=sjmann" title="Code">💻</a> <a href="#content-sjmann" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://smmdb.net/"><img src="https://avatars2.githubusercontent.com/u/5855071?v=4?s=100" width="100px;" alt="Mario Reder"/><br /><sub><b>Mario Reder</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=Tarnadas" title="Code">💻</a> <a href="#content-Tarnadas" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://keybase.io/skim"><img src="https://avatars0.githubusercontent.com/u/47347?v=4?s=100" width="100px;" alt="skim"/><br /><sub><b>skim</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=sl4m" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/sanjaykdragon"><img src="https://avatars1.githubusercontent.com/u/10261698?v=4?s=100" width="100px;" alt="Sanjay K"/><br /><sub><b>Sanjay K</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=sanjaykdragon" title="Code">💻</a> <a href="#content-sanjaykdragon" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://www.rohanjain.in"><img src="https://avatars1.githubusercontent.com/u/343499?v=4?s=100" width="100px;" alt="Rohan Jain"/><br /><sub><b>Rohan Jain</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=crodjer" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://www.saidaspen.se"><img src="https://avatars1.githubusercontent.com/u/7727687?v=4?s=100" width="100px;" alt="Said Aspen"/><br /><sub><b>Said Aspen</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=saidaspen" title="Code">💻</a> <a href="#content-saidaspen" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/uce"><img src="https://avatars3.githubusercontent.com/u/1756620?v=4?s=100" width="100px;" alt="Ufuk Celebi"/><br /><sub><b>Ufuk Celebi</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=uce" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/lebedevsergey"><img src="https://avatars2.githubusercontent.com/u/7325764?v=4?s=100" width="100px;" alt="lebedevsergey"/><br /><sub><b>lebedevsergey</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=lebedevsergey" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/avrong"><img src="https://avatars2.githubusercontent.com/u/6342851?v=4?s=100" width="100px;" alt="Aleksei Trifonov"/><br /><sub><b>Aleksei Trifonov</b></sub></a><br /><a href="#content-avrong" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://drn.ie"><img src="https://avatars2.githubusercontent.com/u/411136?v=4?s=100" width="100px;" alt="Darren Meehan"/><br /><sub><b>Darren Meehan</b></sub></a><br /><a href="#content-Darrenmeehan" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/jihchi"><img src="https://avatars1.githubusercontent.com/u/87983?v=4?s=100" width="100px;" alt="Jihchi Lee"/><br /><sub><b>Jihchi Lee</b></sub></a><br /><a href="#content-jihchi" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/bertonha"><img src="https://avatars3.githubusercontent.com/u/1225902?v=4?s=100" width="100px;" alt="Christofer Bertonha"/><br /><sub><b>Christofer Bertonha</b></sub></a><br /><a href="#content-bertonha" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/apatniv"><img src="https://avatars2.githubusercontent.com/u/22565917?v=4?s=100" width="100px;" alt="Vivek Bharath Akupatni"/><br /><sub><b>Vivek Bharath Akupatni</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=apatniv" title="Code">💻</a> <a href="https://github.com/rust-lang/rustlings/commits?author=apatniv" title="Tests">⚠️</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/DiD92"><img src="https://avatars3.githubusercontent.com/u/6002416?v=4?s=100" width="100px;" alt="Dídac Sementé Fernández"/><br /><sub><b>Dídac Sementé Fernández</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=DiD92" title="Code">💻</a> <a href="#content-DiD92" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/wrobstory"><img src="https://avatars3.githubusercontent.com/u/2601457?v=4?s=100" width="100px;" alt="Rob Story"/><br /><sub><b>Rob Story</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=wrobstory" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/siobhanjacobson"><img src="https://avatars2.githubusercontent.com/u/28983835?v=4?s=100" width="100px;" alt="Siobhan Jacobson"/><br /><sub><b>Siobhan Jacobson</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=siobhanjacobson" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://www.linkedin.com/in/evancarroll/"><img src="https://avatars2.githubusercontent.com/u/19922?v=4?s=100" width="100px;" alt="Evan Carroll"/><br /><sub><b>Evan Carroll</b></sub></a><br /><a href="#content-EvanCarroll" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://www.jawaadmahmood.com"><img src="https://avatars3.githubusercontent.com/u/95606?v=4?s=100" width="100px;" alt="Jawaad Mahmood"/><br /><sub><b>Jawaad Mahmood</b></sub></a><br /><a href="#content-jmahmood" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/GaurangTandon"><img src="https://avatars1.githubusercontent.com/u/6308683?v=4?s=100" width="100px;" alt="Gaurang Tandon"/><br /><sub><b>Gaurang Tandon</b></sub></a><br /><a href="#content-GaurangTandon" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/dev-cyprium"><img src="https://avatars1.githubusercontent.com/u/6002628?v=4?s=100" width="100px;" alt="Stefan Kupresak"/><br /><sub><b>Stefan Kupresak</b></sub></a><br /><a href="#content-dev-cyprium" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/greg-el"><img src="https://avatars3.githubusercontent.com/u/45019882?v=4?s=100" width="100px;" alt="Greg Leonard"/><br /><sub><b>Greg Leonard</b></sub></a><br /><a href="#content-greg-el" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://ryanpcmcquen.org"><img src="https://avatars3.githubusercontent.com/u/772937?v=4?s=100" width="100px;" alt="Ryan McQuen"/><br /><sub><b>Ryan McQuen</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=ryanpcmcquen" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/AnnikaCodes"><img src="https://avatars3.githubusercontent.com/u/56906084?v=4?s=100" width="100px;" alt="Annika"/><br /><sub><b>Annika</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/pulls?q=is%3Apr+reviewed-by%3AAnnikaCodes" title="Reviewed Pull Requests">👀</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://darnuria.eu"><img src="https://avatars1.githubusercontent.com/u/2827553?v=4?s=100" width="100px;" alt="Axel Viala"/><br /><sub><b>Axel Viala</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=darnuria" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://sazid.github.io"><img src="https://avatars1.githubusercontent.com/u/2370167?v=4?s=100" width="100px;" alt="Mohammed Sazid Al Rashid"/><br /><sub><b>Mohammed Sazid Al Rashid</b></sub></a><br /><a href="#content-sazid" title="Content">🖋</a> <a href="https://github.com/rust-lang/rustlings/commits?author=sazid" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://codingthemsoftly.com"><img src="https://avatars1.githubusercontent.com/u/17479099?v=4?s=100" width="100px;" alt="Caleb Webber"/><br /><sub><b>Caleb Webber</b></sub></a><br /><a href="#maintenance-seeplusplus" title="Maintenance">🚧</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/pcn"><img src="https://avatars2.githubusercontent.com/u/1056756?v=4?s=100" width="100px;" alt="Peter N"/><br /><sub><b>Peter N</b></sub></a><br /><a href="#maintenance-pcn" title="Maintenance">🚧</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/seancad"><img src="https://avatars1.githubusercontent.com/u/47405611?v=4?s=100" width="100px;" alt="seancad"/><br /><sub><b>seancad</b></sub></a><br /><a href="#maintenance-seancad" title="Maintenance">🚧</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://willhayworth.com"><img src="https://avatars3.githubusercontent.com/u/181174?v=4?s=100" width="100px;" alt="Will Hayworth"/><br /><sub><b>Will Hayworth</b></sub></a><br /><a href="#content-wsh" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/chrizel"><img src="https://avatars3.githubusercontent.com/u/20802?v=4?s=100" width="100px;" alt="Christian Zeller"/><br /><sub><b>Christian Zeller</b></sub></a><br /><a href="#content-chrizel" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/jfchevrette"><img src="https://avatars.githubusercontent.com/u/3001?v=4?s=100" width="100px;" alt="Jean-Francois Chevrette"/><br /><sub><b>Jean-Francois Chevrette</b></sub></a><br /><a href="#content-jfchevrette" title="Content">🖋</a> <a href="https://github.com/rust-lang/rustlings/commits?author=jfchevrette" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/jbaber"><img src="https://avatars.githubusercontent.com/u/1908117?v=4?s=100" width="100px;" alt="John Baber-Lucero"/><br /><sub><b>John Baber-Lucero</b></sub></a><br /><a href="#content-jbaber" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/tal-zvon"><img src="https://avatars.githubusercontent.com/u/3195851?v=4?s=100" width="100px;" alt="Tal"/><br /><sub><b>Tal</b></sub></a><br /><a href="#content-tal-zvon" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/apogeeoak"><img src="https://avatars.githubusercontent.com/u/59737221?v=4?s=100" width="100px;" alt="apogeeoak"/><br /><sub><b>apogeeoak</b></sub></a><br /><a href="#content-apogeeoak" title="Content">🖋</a> <a href="https://github.com/rust-lang/rustlings/commits?author=apogeeoak" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://www.garfieldtech.com/"><img src="https://avatars.githubusercontent.com/u/254863?v=4?s=100" width="100px;" alt="Larry Garfield"/><br /><sub><b>Larry Garfield</b></sub></a><br /><a href="#content-Crell" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/circumspect"><img src="https://avatars.githubusercontent.com/u/40770208?v=4?s=100" width="100px;" alt="circumspect"/><br /><sub><b>circumspect</b></sub></a><br /><a href="#content-circumspect" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/cjwyett"><img src="https://avatars.githubusercontent.com/u/34195737?v=4?s=100" width="100px;" alt="Cyrus Wyett"/><br /><sub><b>Cyrus Wyett</b></sub></a><br /><a href="#content-cjwyett" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/cadolphs"><img src="https://avatars.githubusercontent.com/u/13894820?v=4?s=100" width="100px;" alt="cadolphs"/><br /><sub><b>cadolphs</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=cadolphs" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://www.haveneer.com"><img src="https://avatars.githubusercontent.com/u/26146722?v=4?s=100" width="100px;" alt="Pascal H."/><br /><sub><b>Pascal H.</b></sub></a><br /><a href="#content-hpwxf" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://twitter.com/chapeupreto"><img src="https://avatars.githubusercontent.com/u/834048?v=4?s=100" width="100px;" alt="Rod Elias"/><br /><sub><b>Rod Elias</b></sub></a><br /><a href="#content-chapeupreto" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/blerchy"><img src="https://avatars.githubusercontent.com/u/2555355?v=4?s=100" width="100px;" alt="Matt Lebl"/><br /><sub><b>Matt Lebl</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=blerchy" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://flakolefluk.dev"><img src="https://avatars.githubusercontent.com/u/11986564?v=4?s=100" width="100px;" alt="Ignacio Le Fluk"/><br /><sub><b>Ignacio Le Fluk</b></sub></a><br /><a href="#content-flakolefluk" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/tlyu"><img src="https://avatars.githubusercontent.com/u/431873?v=4?s=100" width="100px;" alt="Taylor Yu"/><br /><sub><b>Taylor Yu</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=tlyu" title="Code">💻</a> <a href="#content-tlyu" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://zerotask.github.io"><img src="https://avatars.githubusercontent.com/u/20150243?v=4?s=100" width="100px;" alt="Patrick Hintermayer"/><br /><sub><b>Patrick Hintermayer</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=Zerotask" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://petkopavlovski.com/"><img src="https://avatars.githubusercontent.com/u/32264020?v=4?s=100" width="100px;" alt="Pete Pavlovski"/><br /><sub><b>Pete Pavlovski</b></sub></a><br /><a href="#content-arthas168" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/k12ish"><img src="https://avatars.githubusercontent.com/u/45272873?v=4?s=100" width="100px;" alt="k12ish"/><br /><sub><b>k12ish</b></sub></a><br /><a href="#content-k12ish" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/hongshaoyang"><img src="https://avatars.githubusercontent.com/u/19281800?v=4?s=100" width="100px;" alt="Shao Yang Hong"/><br /><sub><b>Shao Yang Hong</b></sub></a><br /><a href="#content-hongshaoyang" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/bmacer"><img src="https://avatars.githubusercontent.com/u/13931806?v=4?s=100" width="100px;" alt="Brandon Macer"/><br /><sub><b>Brandon Macer</b></sub></a><br /><a href="#content-bmacer" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/stoiandan"><img src="https://avatars.githubusercontent.com/u/10388612?v=4?s=100" width="100px;" alt="Stoian Dan"/><br /><sub><b>Stoian Dan</b></sub></a><br /><a href="#content-stoiandan" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://about.me/pjdelport"><img src="https://avatars.githubusercontent.com/u/630271?v=4?s=100" width="100px;" alt="Pi Delport"/><br /><sub><b>Pi Delport</b></sub></a><br /><a href="#content-PiDelport" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/sateeshkumarb"><img src="https://avatars.githubusercontent.com/u/429263?v=4?s=100" width="100px;" alt="Sateesh "/><br /><sub><b>Sateesh </b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=sateeshkumarb" title="Code">💻</a> <a href="#content-sateeshkumarb" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/kayuapi"><img src="https://avatars.githubusercontent.com/u/10304328?v=4?s=100" width="100px;" alt="ZC"/><br /><sub><b>ZC</b></sub></a><br /><a href="#content-kayuapi" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/hyperparabolic"><img src="https://avatars.githubusercontent.com/u/12348474?v=4?s=100" width="100px;" alt="hyperparabolic"/><br /><sub><b>hyperparabolic</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=hyperparabolic" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://www.net4visions.at"><img src="https://avatars.githubusercontent.com/u/5228369?v=4?s=100" width="100px;" alt="arlecchino"/><br /><sub><b>arlecchino</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=kolbma" title="Documentation">📖</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://richthofen.io/"><img src="https://avatars.githubusercontent.com/u/7576730?v=4?s=100" width="100px;" alt="Richthofen"/><br /><sub><b>Richthofen</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=jazzplato" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/cseltol"><img src="https://avatars.githubusercontent.com/u/64264529?v=4?s=100" width="100px;" alt="Ivan Nerazumov"/><br /><sub><b>Ivan Nerazumov</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=cseltol" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/lauralindzey"><img src="https://avatars.githubusercontent.com/u/65185744?v=4?s=100" width="100px;" alt="lauralindzey"/><br /><sub><b>lauralindzey</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=lauralindzey" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/sinharaksh1t"><img src="https://avatars.githubusercontent.com/u/28585848?v=4?s=100" width="100px;" alt="Rakshit Sinha"/><br /><sub><b>Rakshit Sinha</b></sub></a><br /><a href="#content-sinharaksh1t" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/dbednar230"><img src="https://avatars.githubusercontent.com/u/54457902?v=4?s=100" width="100px;" alt="Damian"/><br /><sub><b>Damian</b></sub></a><br /><a href="#content-dbednar230" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://benarmstead.co.uk"><img src="https://avatars.githubusercontent.com/u/70973680?v=4?s=100" width="100px;" alt="Ben Armstead"/><br /><sub><b>Ben Armstead</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=benarmstead" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/anuk909"><img src="https://avatars.githubusercontent.com/u/34924662?v=4?s=100" width="100px;" alt="anuk909"/><br /><sub><b>anuk909</b></sub></a><br /><a href="#content-anuk909" title="Content">🖋</a> <a href="https://github.com/rust-lang/rustlings/commits?author=anuk909" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://granddaifuku.com/"><img src="https://avatars.githubusercontent.com/u/49578068?v=4?s=100" width="100px;" alt="granddaifuku"/><br /><sub><b>granddaifuku</b></sub></a><br /><a href="#content-granddaifuku" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://weilet.me"><img src="https://avatars.githubusercontent.com/u/32561597?v=4?s=100" width="100px;" alt="Weilet"/><br /><sub><b>Weilet</b></sub></a><br /><a href="#content-Weilet" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Millione"><img src="https://avatars.githubusercontent.com/u/38575932?v=4?s=100" width="100px;" alt="LIU JIE"/><br /><sub><b>LIU JIE</b></sub></a><br /><a href="#content-Millione" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/abusch"><img src="https://avatars.githubusercontent.com/u/506344?v=4?s=100" width="100px;" alt="Antoine Büsch"/><br /><sub><b>Antoine Büsch</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=abusch" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://frogtd.com/"><img src="https://avatars.githubusercontent.com/u/31412003?v=4?s=100" width="100px;" alt="frogtd"/><br /><sub><b>frogtd</b></sub></a><br /><a href="#content-frogtd" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/EmisonLu"><img src="https://avatars.githubusercontent.com/u/54395432?v=4?s=100" width="100px;" alt="Zhenghao Lu"/><br /><sub><b>Zhenghao Lu</b></sub></a><br /><a href="#content-EmisonLu" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://soundtrackyourbrand.com"><img src="https://avatars.githubusercontent.com/u/762956?v=4?s=100" width="100px;" alt="Fredrik Enestad"/><br /><sub><b>Fredrik Enestad</b></sub></a><br /><a href="#content-fredr" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://xuesong.pydevops.com"><img src="https://avatars.githubusercontent.com/u/18476085?v=4?s=100" width="100px;" alt="xuesong"/><br /><sub><b>xuesong</b></sub></a><br /><a href="#content-xuesongbj" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/MpdWalsh"><img src="https://avatars.githubusercontent.com/u/48160144?v=4?s=100" width="100px;" alt="Michael Walsh"/><br /><sub><b>Michael Walsh</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=MpdWalsh" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/alirezaghey"><img src="https://avatars.githubusercontent.com/u/26653424?v=4?s=100" width="100px;" alt="alirezaghey"/><br /><sub><b>alirezaghey</b></sub></a><br /><a href="#content-alirezaghey" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/frvannes16"><img src="https://avatars.githubusercontent.com/u/3188475?v=4?s=100" width="100px;" alt="Franklin van Nes"/><br /><sub><b>Franklin van Nes</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=frvannes16" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://nekonako.github.io"><img src="https://avatars.githubusercontent.com/u/46141275?v=4?s=100" width="100px;" alt="nekonako"/><br /><sub><b>nekonako</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=nekonako" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/tan-zx"><img src="https://avatars.githubusercontent.com/u/67887489?v=4?s=100" width="100px;" alt="ZX"/><br /><sub><b>ZX</b></sub></a><br /><a href="#content-tan-zx" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/sundevilyang"><img src="https://avatars.githubusercontent.com/u/1499214?v=4?s=100" width="100px;" alt="Yang Wen"/><br /><sub><b>Yang Wen</b></sub></a><br /><a href="#content-sundevilyang" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://brandon-high.com"><img src="https://avatars.githubusercontent.com/u/759848?v=4?s=100" width="100px;" alt="Brandon High"/><br /><sub><b>Brandon High</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=highb" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/x-hgg-x"><img src="https://avatars.githubusercontent.com/u/39058530?v=4?s=100" width="100px;" alt="x-hgg-x"/><br /><sub><b>x-hgg-x</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=x-hgg-x" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://kisaragieffective.github.io"><img src="https://avatars.githubusercontent.com/u/48310258?v=4?s=100" width="100px;" alt="Kisaragi"/><br /><sub><b>Kisaragi</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=KisaragiEffective" title="Documentation">📖</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Kallu-A"><img src="https://avatars.githubusercontent.com/u/73198738?v=4?s=100" width="100px;" alt="Lucas Aries"/><br /><sub><b>Lucas Aries</b></sub></a><br /><a href="#content-Kallu-A" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/ragreenburg"><img src="https://avatars.githubusercontent.com/u/24358100?v=4?s=100" width="100px;" alt="ragreenburg"/><br /><sub><b>ragreenburg</b></sub></a><br /><a href="#content-ragreenburg" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/stevenfukase"><img src="https://avatars.githubusercontent.com/u/66785624?v=4?s=100" width="100px;" alt="stevenfukase"/><br /><sub><b>stevenfukase</b></sub></a><br /><a href="#content-stevenfukase" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/J-S-Kim"><img src="https://avatars.githubusercontent.com/u/17569303?v=4?s=100" width="100px;" alt="J-S-Kim"/><br /><sub><b>J-S-Kim</b></sub></a><br /><a href="#content-J-S-Kim" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Fointard"><img src="https://avatars.githubusercontent.com/u/9333398?v=4?s=100" width="100px;" alt="Fointard"/><br /><sub><b>Fointard</b></sub></a><br /><a href="#content-Fointard" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/rytheo"><img src="https://avatars.githubusercontent.com/u/22184325?v=4?s=100" width="100px;" alt="Ryan Lowe"/><br /><sub><b>Ryan Lowe</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=rytheo" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://www.dashen.tech"><img src="https://avatars.githubusercontent.com/u/15921519?v=4?s=100" width="100px;" alt="cui fliter"/><br /><sub><b>cui fliter</b></sub></a><br /><a href="#content-cuishuang" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/luskwater"><img src="https://avatars.githubusercontent.com/u/42529?v=4?s=100" width="100px;" alt="Ron Lusk"/><br /><sub><b>Ron Lusk</b></sub></a><br /><a href="#content-luskwater" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="http://liby.github.io/liby/"><img src="https://avatars.githubusercontent.com/u/38807139?v=4?s=100" width="100px;" alt="Bryan Lee"/><br /><sub><b>Bryan Lee</b></sub></a><br /><a href="#content-liby" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://nandaja.space"><img src="https://avatars.githubusercontent.com/u/2624550?v=4?s=100" width="100px;" alt="Nandaja Varma"/><br /><sub><b>Nandaja Varma</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=nandajavarma" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/merelymyself"><img src="https://avatars.githubusercontent.com/u/88221256?v=4?s=100" width="100px;" alt="pwygab"/><br /><sub><b>pwygab</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=merelymyself" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://linkedin.com/in/lucasgrvarela"><img src="https://avatars.githubusercontent.com/u/37870368?v=4?s=100" width="100px;" alt="Lucas Grigolon Varela"/><br /><sub><b>Lucas Grigolon Varela</b></sub></a><br /><a href="#content-lucasgrvarela" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/bufo24"><img src="https://avatars.githubusercontent.com/u/32884105?v=4?s=100" width="100px;" alt="Bufo"/><br /><sub><b>Bufo</b></sub></a><br /><a href="#content-bufo24" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://rustnote.com"><img src="https://avatars.githubusercontent.com/u/77730378?v=4?s=100" width="100px;" alt="Jack Clayton"/><br /><sub><b>Jack Clayton</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=jackos" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/klkl0808"><img src="https://avatars.githubusercontent.com/u/24694249?v=4?s=100" width="100px;" alt="Konstantin"/><br /><sub><b>Konstantin</b></sub></a><br /><a href="#content-klkl0808" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/0pling"><img src="https://avatars.githubusercontent.com/u/104090344?v=4?s=100" width="100px;" alt="0pling"/><br /><sub><b>0pling</b></sub></a><br /><a href="#content-0pling" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/KatanaFluorescent"><img src="https://avatars.githubusercontent.com/u/60199077?v=4?s=100" width="100px;" alt="KatanaFluorescent"/><br /><sub><b>KatanaFluorescent</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=KatanaFluorescent" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Drew-Morris"><img src="https://avatars.githubusercontent.com/u/95818166?v=4?s=100" width="100px;" alt="Drew Morris"/><br /><sub><b>Drew Morris</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=Drew-Morris" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/camperdue42"><img src="https://avatars.githubusercontent.com/u/43047763?v=4?s=100" width="100px;" alt="camperdue42"/><br /><sub><b>camperdue42</b></sub></a><br /><a href="#content-camperdue42" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/YsuOS"><img src="https://avatars.githubusercontent.com/u/30138661?v=4?s=100" width="100px;" alt="YsuOS"/><br /><sub><b>YsuOS</b></sub></a><br /><a href="#content-YsuOS" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://lichess.org/@/StevenEmily"><img src="https://avatars.githubusercontent.com/u/58114641?v=4?s=100" width="100px;" alt="Steven Nguyen"/><br /><sub><b>Steven Nguyen</b></sub></a><br /><a href="#content-icecream17" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://noahcairns.dev"><img src="https://avatars.githubusercontent.com/u/94420090?v=4?s=100" width="100px;" alt="nacairns1"/><br /><sub><b>nacairns1</b></sub></a><br /><a href="#content-nacairns1" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/pgjbz"><img src="https://avatars.githubusercontent.com/u/22059237?v=4?s=100" width="100px;" alt="Paulo Gabriel Justino Bezerra"/><br /><sub><b>Paulo Gabriel Justino Bezerra</b></sub></a><br /><a href="#content-pgjbz" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/jaystile"><img src="https://avatars.githubusercontent.com/u/46078028?v=4?s=100" width="100px;" alt="Jason"/><br /><sub><b>Jason</b></sub></a><br /><a href="#content-jaystile" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://exdx.github.io"><img src="https://avatars.githubusercontent.com/u/31546601?v=4?s=100" width="100px;" alt="exdx"/><br /><sub><b>exdx</b></sub></a><br /><a href="#content-exdx" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Jzow"><img src="https://avatars.githubusercontent.com/u/68860495?v=4?s=100" width="100px;" alt="James Zow"/><br /><sub><b>James Zow</b></sub></a><br /><a href="#content-Jzow" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://jamesabromley.wordpress.com/"><img src="https://avatars.githubusercontent.com/u/2474334?v=4?s=100" width="100px;" alt="James Bromley"/><br /><sub><b>James Bromley</b></sub></a><br /><a href="#content-jayber" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/swhiteCQC"><img src="https://avatars.githubusercontent.com/u/77438466?v=4?s=100" width="100px;" alt="swhiteCQC"/><br /><sub><b>swhiteCQC</b></sub></a><br /><a href="#content-swhiteCQC" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/neilpate"><img src="https://avatars.githubusercontent.com/u/7802334?v=4?s=100" width="100px;" alt="Neil Pate"/><br /><sub><b>Neil Pate</b></sub></a><br /><a href="#content-neilpate" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://wojexe.com"><img src="https://avatars.githubusercontent.com/u/21208490?v=4?s=100" width="100px;" alt="wojexe"/><br /><sub><b>wojexe</b></sub></a><br /><a href="#content-wojexe" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Tostapunk"><img src="https://avatars.githubusercontent.com/u/25140297?v=4?s=100" width="100px;" alt="Mattia Schiavon"/><br /><sub><b>Mattia Schiavon</b></sub></a><br /><a href="#content-Tostapunk" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://toucantoco.com"><img src="https://avatars.githubusercontent.com/u/18406791?v=4?s=100" width="100px;" alt="Eric Jolibois"/><br /><sub><b>Eric Jolibois</b></sub></a><br /><a href="#content-PrettyWood" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="http://edwinchang.vercel.app"><img src="https://avatars.githubusercontent.com/u/88263098?v=4?s=100" width="100px;" alt="Edwin Chang"/><br /><sub><b>Edwin Chang</b></sub></a><br /><a href="#content-EdwinChang24" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://saikat.dev/"><img src="https://avatars.githubusercontent.com/u/7412443?v=4?s=100" width="100px;" alt="Saikat Das"/><br /><sub><b>Saikat Das</b></sub></a><br /><a href="#content-saikatdas0790" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/thatlittleboy"><img src="https://avatars.githubusercontent.com/u/30731072?v=4?s=100" width="100px;" alt="Jeremy Goh"/><br /><sub><b>Jeremy Goh</b></sub></a><br /><a href="#content-thatlittleboy" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Lioness100"><img src="https://avatars.githubusercontent.com/u/65814829?v=4?s=100" width="100px;" alt="Lioness100"/><br /><sub><b>Lioness100</b></sub></a><br /><a href="#content-Lioness100" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/tvkn"><img src="https://avatars.githubusercontent.com/u/79277926?v=4?s=100" width="100px;" alt="Tristan Nicholls"/><br /><sub><b>Tristan Nicholls</b></sub></a><br /><a href="#content-tvkn" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://clairewang.net"><img src="https://avatars.githubusercontent.com/u/9344258?v=4?s=100" width="100px;" alt="Claire"/><br /><sub><b>Claire</b></sub></a><br /><a href="#content-clairew" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Mouwrice"><img src="https://avatars.githubusercontent.com/u/56763273?v=4?s=100" width="100px;" alt="Maurice Van Wassenhove"/><br /><sub><b>Maurice Van Wassenhove</b></sub></a><br /><a href="#content-Mouwrice" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://jmthree.com"><img src="https://avatars.githubusercontent.com/u/77524?v=4?s=100" width="100px;" alt="John Mendelewski"/><br /><sub><b>John Mendelewski</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=johnmendel" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="http://fakhoury.xyz"><img src="https://avatars.githubusercontent.com/u/20828724?v=4?s=100" width="100px;" alt="Brian Fakhoury"/><br /><sub><b>Brian Fakhoury</b></sub></a><br /><a href="#content-brianfakhoury" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/markusboehme"><img src="https://avatars.githubusercontent.com/u/5074759?v=4?s=100" width="100px;" alt="Markus Boehme"/><br /><sub><b>Markus Boehme</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=markusboehme" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/nico-vromans"><img src="https://avatars.githubusercontent.com/u/48183857?v=4?s=100" width="100px;" alt="Nico Vromans"/><br /><sub><b>Nico Vromans</b></sub></a><br /><a href="#content-nico-vromans" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/vostok92"><img src="https://avatars.githubusercontent.com/u/540339?v=4?s=100" width="100px;" alt="vostok92"/><br /><sub><b>vostok92</b></sub></a><br /><a href="#content-vostok92" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://magnusrodseth.vercel.app"><img src="https://avatars.githubusercontent.com/u/59113973?v=4?s=100" width="100px;" alt="Magnus Rødseth"/><br /><sub><b>Magnus Rødseth</b></sub></a><br /><a href="#content-magnusrodseth" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/rubiesonthesky"><img src="https://avatars.githubusercontent.com/u/2591240?v=4?s=100" width="100px;" alt="rubiesonthesky"/><br /><sub><b>rubiesonthesky</b></sub></a><br /><a href="#content-rubiesonthesky" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://www.gabrielbianconi.com/"><img src="https://avatars.githubusercontent.com/u/1275491?v=4?s=100" width="100px;" alt="Gabriel Bianconi"/><br /><sub><b>Gabriel Bianconi</b></sub></a><br /><a href="#content-GabrielBianconi" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/Kodylow"><img src="https://avatars.githubusercontent.com/u/74332828?v=4?s=100" width="100px;" alt="Kody Low"/><br /><sub><b>Kody Low</b></sub></a><br /><a href="#content-Kodylow" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/rzrymiak"><img src="https://avatars.githubusercontent.com/u/106121613?v=4?s=100" width="100px;" alt="rzrymiak"/><br /><sub><b>rzrymiak</b></sub></a><br /><a href="#content-rzrymiak" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/miguelraz"><img src="https://avatars.githubusercontent.com/u/13056181?v=4?s=100" width="100px;" alt="Miguel Raz Guzmán Macedo"/><br /><sub><b>Miguel Raz Guzmán Macedo</b></sub></a><br /><a href="#content-miguelraz" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/memark"><img src="https://avatars.githubusercontent.com/u/318504?v=4?s=100" width="100px;" alt="Magnus Markling"/><br /><sub><b>Magnus Markling</b></sub></a><br /><a href="#content-memark" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/gasparitiago"><img src="https://avatars.githubusercontent.com/u/3237254?v=4?s=100" width="100px;" alt="Tiago De Gaspari"/><br /><sub><b>Tiago De Gaspari</b></sub></a><br /><a href="#content-gasparitiago" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/skaunov"><img src="https://avatars.githubusercontent.com/u/65976143?v=4?s=100" width="100px;" alt="skaunov"/><br /><sub><b>skaunov</b></sub></a><br /><a href="#content-skaunov" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://caljacobson.dev"><img src="https://avatars.githubusercontent.com/u/9152032?v=4?s=100" width="100px;" alt="Cal Jacobson"/><br /><sub><b>Cal Jacobson</b></sub></a><br /><a href="#content-cj81499" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/duchonic"><img src="https://avatars.githubusercontent.com/u/34117620?v=4?s=100" width="100px;" alt="Duchoud Nicolas"/><br /><sub><b>Duchoud Nicolas</b></sub></a><br /><a href="#content-duchonic" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/gfaugere"><img src="https://avatars.githubusercontent.com/u/11901979?v=4?s=100" width="100px;" alt="Gaëtan Faugère"/><br /><sub><b>Gaëtan Faugère</b></sub></a><br /><a href="#tool-gfaugere" title="Tools">🔧</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/bhbuehler"><img src="https://avatars.githubusercontent.com/u/25541343?v=4?s=100" width="100px;" alt="bhbuehler"/><br /><sub><b>bhbuehler</b></sub></a><br /><a href="#content-bhbuehler" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/nyurik"><img src="https://avatars.githubusercontent.com/u/1641515?v=4?s=100" width="100px;" alt="Yuri Astrakhan"/><br /><sub><b>Yuri Astrakhan</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=nyurik" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://azzamsa.com"><img src="https://avatars.githubusercontent.com/u/17734314?v=4?s=100" width="100px;" alt="azzamsa"/><br /><sub><b>azzamsa</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=azzamsa" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/mvanschellebeeck"><img src="https://avatars.githubusercontent.com/u/17671052?v=4?s=100" width="100px;" alt="mvanschellebeeck"/><br /><sub><b>mvanschellebeeck</b></sub></a><br /><a href="#content-mvanschellebeeck" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/aaarkid"><img src="https://avatars.githubusercontent.com/u/39987510?v=4?s=100" width="100px;" alt="Arkid"/><br /><sub><b>Arkid</b></sub></a><br /><a href="#content-aaarkid" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://tfpk.dev"><img src="https://avatars.githubusercontent.com/u/10906982?v=4?s=100" width="100px;" alt="Tom Kunc"/><br /><sub><b>Tom Kunc</b></sub></a><br /><a href="#content-tfpk" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/mfurak"><img src="https://avatars.githubusercontent.com/u/38523093?v=4?s=100" width="100px;" alt="Marek Furák"/><br /><sub><b>Marek Furák</b></sub></a><br /><a href="#content-mfurak" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://winter.cafe"><img src="https://avatars.githubusercontent.com/u/78392041?v=4?s=100" width="100px;" alt="Winter"/><br /><sub><b>Winter</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=winterqt" title="Code">💻</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://moritzboeh.me"><img src="https://avatars.githubusercontent.com/u/42215704?v=4?s=100" width="100px;" alt="Moritz Böhme"/><br /><sub><b>Moritz Böhme</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=MoritzBoehme" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/craymel"><img src="https://avatars.githubusercontent.com/u/71062756?v=4?s=100" width="100px;" alt="craymel"/><br /><sub><b>craymel</b></sub></a><br /><a href="#content-craymel" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/tkburis"><img src="https://avatars.githubusercontent.com/u/20501289?v=4?s=100" width="100px;" alt="TK Buristrakul"/><br /><sub><b>TK Buristrakul</b></sub></a><br /><a href="#content-tkburis" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/HerschelW"><img src="https://avatars.githubusercontent.com/u/17935816?v=4?s=100" width="100px;" alt="Kent Worthington"/><br /><sub><b>Kent Worthington</b></sub></a><br /><a href="#content-HerschelW" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/seporterfield"><img src="https://avatars.githubusercontent.com/u/107010978?v=4?s=100" width="100px;" alt="seporterfield"/><br /><sub><b>seporterfield</b></sub></a><br /><a href="#content-seporterfield" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://www.linkedin.com/in/dbarrosop"><img src="https://avatars.githubusercontent.com/u/6246622?v=4?s=100" width="100px;" alt="David Barroso"/><br /><sub><b>David Barroso</b></sub></a><br /><a href="#infra-dbarrosop" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://distanz.ch"><img src="https://avatars.githubusercontent.com/u/539708?v=4?s=100" width="100px;" alt="Tobias Klauser"/><br /><sub><b>Tobias Klauser</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=tklauser" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/0xMySt1c"><img src="https://avatars.githubusercontent.com/u/101825630?v=4?s=100" width="100px;" alt="0xMySt1c"/><br /><sub><b>0xMySt1c</b></sub></a><br /><a href="#tool-0xMySt1c" title="Tools">🔧</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/AxolotlTears"><img src="https://avatars.githubusercontent.com/u/87157047?v=4?s=100" width="100px;" alt="Ten"/><br /><sub><b>Ten</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=AxolotlTears" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://h4x5p4c3.xyz"><img src="https://avatars.githubusercontent.com/u/66133688?v=4?s=100" width="100px;" alt="jones martin"/><br /><sub><b>jones martin</b></sub></a><br /><a href="#content-h4x5p4c3" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/cloppingemu"><img src="https://avatars.githubusercontent.com/u/12227963?v=4?s=100" width="100px;" alt="cloppingemu"/><br /><sub><b>cloppingemu</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=cloppingemu" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://github.com/zeromicro/go-zero"><img src="https://avatars.githubusercontent.com/u/1918356?v=4?s=100" width="100px;" alt="Kevin Wan"/><br /><sub><b>Kevin Wan</b></sub></a><br /><a href="#content-kevwan" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="http://kurowasaruby.cn"><img src="https://avatars.githubusercontent.com/u/43495006?v=4?s=100" width="100px;" alt="Ruby"/><br /><sub><b>Ruby</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=wjwrh" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/alexandergill"><img src="https://avatars.githubusercontent.com/u/7033716?v=4?s=100" width="100px;" alt="Alexander Gill"/><br /><sub><b>Alexander Gill</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=alexandergill" title="Code">💻</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://www.linkedin.com/in/jarrod-sanders/"><img src="https://avatars.githubusercontent.com/u/50600614?v=4?s=100" width="100px;" alt="Jarrod Sanders"/><br /><sub><b>Jarrod Sanders</b></sub></a><br /><a href="#content-kawaiiPlat" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/platformer"><img src="https://avatars.githubusercontent.com/u/40146328?v=4?s=100" width="100px;" alt="Andrew Sen"/><br /><sub><b>Andrew Sen</b></sub></a><br /><a href="#content-platformer" title="Content">🖋</a></td>
+    </tr>
+    <tr>
+      <td align="center" valign="top" width="12.5%"><a href="https://grzegorz-zur.com/"><img src="https://avatars.githubusercontent.com/u/5297583?v=4?s=100" width="100px;" alt="Grzegorz Żur"/><br /><sub><b>Grzegorz Żur</b></sub></a><br /><a href="#content-grzegorz-zur" title="Content">🖋</a></td>
+    </tr>
+  </tbody>
+</table>
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!

CHANGELOG.md

@@ -1,289 +1,4 @@
-## Unreleased
-
-### Changed
-
-- Upgrade to Rust edition 2024
-- Raise the minimum supported Rust version to `1.87`
-
-## 6.4.0 (2024-11-11)
-
-### Added
-
-- The list of exercises is now searchable by pressing `s` or `/` 🔍️ (thanks to [@frroossst](https://github.com/frroossst))
-- New option `c` in the prompt to manually check all exercises ✅ (thanks to [@Nahor](https://github.com/Nahor))
-- New command `check-all` to manually check all exercises ✅ (thanks to [@Nahor](https://github.com/Nahor))
-- Addictive animation for showing the progress of checking all exercises. A nice showcase of parallelism in Rust ✨
-- New option `x` in the prompt to reset the file of the current exercise 🔄
-- Allow `dead_code` for all exercises and solutions ⚰️ (thanks to [@huss4in](https://github.com/huss4in))
-- Pause input while running an exercise to avoid unexpected prompt interactions ⏸️
-- Limit the maximum number of exercises to 999. Any community exercises willing to reach that limit? 🔝
-
-### Changed
-
-- `enums3`: Remove redundant enum definition task (thanks to [@senekor](https://github.com/senekor))
-- `if2`: Make the exercise less confusing by avoiding "fizz", "fuzz", "foo", "bar" and "baz" (thanks to [@senekor](https://github.com/senekor))
-- `hashmap3`: Use the method `Entry::or_default`.
-- Update the state of all exercises when checking all of them (thanks to [@Nahor](https://github.com/Nahor))
-- The main prompt doesn't need a confirmation with ENTER on Unix-like systems anymore.
-- No more jumping back to a previous exercise when its file is changed. Use the list to jump between exercises.
-- Dump the solution file after an exercise is done even if the solution's directory doesn't exist.
-- Rework the footer in the list.
-- Optimize the file watcher.
-
-### Fixed
-
-- Fix bad contrast in the list on terminals with a light theme.
-
-## 6.3.0 (2024-08-29)
-
-### Added
-
-- Add the following exercise lints:
-  - `forbid(unsafe_code)`: You shouldn't write unsafe code in Rustlings.
-  - `forbid(unstable_features)`: You don't need unstable features in Rustlings and shouldn't rely on them while learning Rust.
-  - `forbid(todo)`: You forgot a `todo!()`.
-  - `forbid(empty_loop)`: This can only happen by mistake in Rustlings.
-  - `deny(infinite_loop)`: No infinite loops are needed in Rustlings.
-  - `deny(mem_forget)`: You shouldn't leak memory while still learning Rust.
-- Show a link to every exercise file in the list.
-- Add scroll padding in the list.
-- Break the help footer of the list into two lines when the terminal width isn't big enough.
-- Enable scrolling with the mouse in the list.
-- `dev check`: Show the progress of checks.
-- `dev check`: Check that the length of all exercise names is lower than 32.
-- `dev check`: Check if exercise contains no tests and isn't marked with `test = false`.
-
-### Changed
-
-- The compilation time when installing Rustlings is reduced.
-- Pressing `c` in the list for "continue on" now quits the list after setting the selected exercise as the current one.
-- Better highlighting of the solution file after an exercise is done.
-- Don't show the output of successful tests anymore. Instead, show the pretty output for tests.
-- Be explicit about `q` only quitting the list and not the whole program in the list.
-- Be explicit about `r` only resetting one exercise (the selected one) in the list.
-- Ignore the standard output of `git init`.
-- `threads3`: Remove the queue length and improve tests.
-- `errors4`: Use match instead of a comparison chain in the solution.
-- `functions3`: Only take `u8` to avoid using a too high number of iterations by mistake.
-- `dev check`: Always check with strict Clippy (warnings to errors) when checking the solutions.
-
-### Fixed
-
-- Fix the error on some systems about too many open files during the final check of all exercises.
-- Fix the list when the terminal height is too low.
-- Restore the terminal after an error in the list.
-
-## 6.2.0 (2024-08-09)
-
-### Added
-
-- Show a message before checking and running an exercise. This gives the user instant feedback and avoids confusion if the checks take too long.
-- Show a helpful error message when trying to install Rustlings with a Rust version lower than the minimum one that Rustlings supports.
-- Add a `README.md` file to the `solutions/` directory.
-- Allow initializing Rustlings in a Cargo workspace.
-- `dev check`: Check that all solutions are formatted with `rustfmt`.
-
-### Changed
-
-- Remove the state file and the solutions directory from the generated `.gitignore` file.
-- Run the final check of all exercises in parallel.
-- Small exercise improvements.
-
-## 6.1.0 (2024-07-10)
-
-#### Added
-
-- `dev check`: Check that all exercises (including community ones) include at least one `TODO` comment.
-- `dev check`: Check that all exercises actually fail to run (not already solved).
-
-#### Changed
-
-- Make enum variants more consistent between enum exercises.
-- `iterators3`: Teach about the possible case of integer overflow during division.
-
-#### Fixed
-
-- Exit with a helpful error message on missing/unsupported terminal/TTY.
-- Mark the last exercise as done.
-
-## 6.0.1 (2024-07-04)
-
-Small exercise improvements and fixes.
-Most importantly, fixed that the exercise `clippy1` was already solved 😅
-
-## 6.0.0 (2024-07-03)
-
-This release is the result of a complete rewrite to deliver a ton of new features and improvements ✨
-The most important changes are highlighted below.
-
-### Installation
-
-The installation has been simplified a lot!
-To install Rustlings after installing Rust, all what you need to do now is running the following command:
-
-```bash
-cargo install rustlings
-```
-
-Yes, this means that Rustlings is now on [crates.io](https://crates.io/crates/rustlings) 🎉
-
-You can read about the motivations of this change in [this issue](https://github.com/rust-lang/rustlings/issues/1919).
-
-### UI/UX
-
-- The UI is now responsive when the terminal is resized.
-- The progress bar was moved to the bottom so that you can always see your progress and the current exercise to work on.
-- The current exercise path is now a terminal link. It will open the exercise file in your default editor when you click on it.
-- A small prompt is now always shown at the bottom. It allows you to choose an action by entering a character. For example, entering `h` will show you the hint of the current exercise.
-- The comment "I AM NOT DONE!" doesn't exist anymore. Instead of needing to remove it to go to the next exercise, you need to enter `n` in the terminal.
-
-### List mode
-
-A new list mode was added!
-You can enter it by entering `l` in the watch mode.
-It offers the following features:
-
-- Browse all exercises and see their state (pending/done).
-- Filter exercises based on their state (pending/done).
-- Continue at another exercise. This allows you to skip some exercises or go back to previous ones.
-- Reset an exercise so you can start over and revert your changes.
-
-### Solutions
-
-After finishing an exercise, a solution file will be available and Rustlings will show you its path in green.
-This allows you to compare your solution with an idiomatic solution and maybe learn about other ways to solve a problem.
-
-While writing the solutions, all exercises have been polished 🌟
-For example, every exercise now contains `TODO` comments to highlight what the user needs to change and where.
-
-### LSP support out of the box
-
-Instead of creating a `project.json` file using `rustlings lsp`, Rustlings now works with a `Cargo.toml` file out of the box.
-No actions are needed to activate the language server `rust-analyzer`.
-
-This should avoid issues related to the language server or to running exercises, especially the ones with Clippy.
-
-### Clippy
-
-Clippy lints are now shown on all exercises, not only the Clippy exercises 📎
-Make Clippy your friend from early on 🥰
-
-### Community Exercises
-
-Rustlings now supports community exercises!
-
-Do you want to create your own set of Rustlings exercises to focus on some specific topic?
-Or do you want to translate the original Rustlings exercises?
-Then follow the link to the guide about [community exercises](https://rustlings.rust-lang.org/community-exercises)!
-
-## 5.6.1 (2023-09-18)
-
-#### Changed
-
-- Converted all exercises with assertions to test mode.
-
-#### Fixed
-
-- `cow1`: Reverted regression introduced by calling `to_mut` where it
-  shouldn't have been called, and clarified comment.
-- `primitive_types3`: Require at least an array of 100 elements.
-- Removed hint comments when no hint exists for the exercise.
-- `as_ref_mut`: Fixed a typo in a test function name.
-- `enums3`: Fixed formatting with `rustfmt`.
-
-## 5.6.0 (2023-09-04)
-
-#### Added
-
-- New exercise: `if3`, teaching the user about `if let` statements.
-- `hashmaps2`: Added an extra test function to check if the amount of fruits is higher than zero.
-- `enums3`: Added a test for `Message`.
-- `if1`: Added a test case to check equal values.
-- `if3`: Added a note specifying that there are no test changes needed.
-
-#### Changed
-
-- Swapped the order of threads and smart pointer exercises.
-- Rewrote the CLI to use `clap` - it's matured much since we switched to `argh` :)
-- `structs3`: Switched from i32 to u32.
-- `move_semantics`: Switched 1-4 to tests, and rewrote them to be way simpler, while still teaching about the same
-  concepts.
-
-#### Fixed
-
-- `iterators5`:
-  - Removed an outdated part of the hint.
-  - Renamed variables to use snake_case.
-- `vecs2`: Updated the hint to reference the renamed loop variable.
-- `enums3`: Changed message string in test so that it gets properly tested.
-- `strings2`: Corrected line number in hint, then removed it (this both happened as part of this release cycle).
-- `primitive_types4`: Updated hint to the correct ending index.
-- `quiz1`: Removed duplicated sentence from exercise comments.
-- `errors4`: Improved comment.
-- `from_into`: Fixed test values.
-- `cow1`: Added `.to_mut()` to distinguish from the previous test case.
-- `threads2`: Updated hint text to reference the correct book heading.
-
-#### Housekeeping
-
-- Cleaned up the explanation paragraphs at the start of each exercise.
-- Lots of Nix housekeeping that I don't feel qualified to write about!
-- Improved CI workflows, we're now testing on multiple platforms at once.
-
-## 5.5.1 (2023-05-17)
-
-#### Fixed
-
-- Reverted `rust-project.json` path generation due to an upstream `rust-analyzer` fix.
-
-## 5.5.0 (2023-05-17)
-
-#### Added
-
-- `strings2`: Added a reference to the book chapter for reference conversion
-- `lifetimes`: Added a link to the lifetimekata project
-- Added a new `tests4` exercises, which teaches about testing for panics
-- Added a `!` prefix command to watch mode that runs an external command
-- Added a `--success-hints` option to watch mode that shows hints on exercise success
-
-#### Changed
-
-- `vecs2`: Renamed iterator variable bindings for clarify
-- `lifetimes`: Changed order of book references
-- `hashmaps2`: Clarified instructions in the todo block
-- Moved lifetime exercises before test exercises (via the recommended book ordering)
-- `options2`: Improved tests for layering options
-- `modules2`: Added more information to the hint
-
-#### Fixed
-
-- `errors2`: Corrected a comment wording
-- `iterators2`: Fixed a spelling mistake in the hint text
-- `variables`: Wrapped the mut keyword with backticks for readability
-- `move_semantics2`: Removed references to line numbers
-- `cow1`: Clarified the `owned_no_mutation` comments
-- `options3`: Changed exercise to panic when no match is found
-- `rustlings lsp` now generates absolute paths, which should fix VSCode `rust-analyzer` usage on Windows
-
-#### Housekeeping
-
-- Added a markdown linter to run on GitHub actions
-- Split quick installation section into two code blocks
-
-## 5.4.1 (2023-03-10)
-
-#### Changed
-
-- `vecs`: Added links to `iter_mut` and `map` to README.md
-- `cow1`: Changed main to tests
-- `iterators1`: Formatted according to rustfmt
-
-#### Fixed
-
-- `errors5`: Unified undisclosed type notation
-- `arc1`: Improved readability by avoiding implicit dereference
-- `macros4`: Prevented auto-fix by adding `#[rustfmt::skip]`
-- `cli`: Actually show correct progress percentages
+<a name="5.4.0"></a>
 
 ## 5.4.0 (2023-02-12)
 
@@ -313,6 +28,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 
 - Bumped min Rust version to 1.58 in installation script
 
+<a name="5.3.0"></a>
+
 ## 5.3.0 (2022-12-23)
 
 #### Added
@@ -336,7 +53,7 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **structs3**: Clarifed the hint
 - **quiz2, as_ref_mut, options1, traits1, traits2**: Clarified hints
 - **traits1, traits2, cli**: Tidied up unmatching backticks
-- **enums2**: Removed unnecessary indirection of self
+- **enums2**: Removed unneccessary indirection of self
 - **enums3**: Added an extra tuple comment
 
 #### Housekeeping
@@ -345,6 +62,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Applied some Clippy and rustfmt formatting
 - Added a note on Windows PowerShell and other shell compatibility
 
+<a name="5.2.1"></a>
+
 ## 5.2.1 (2022-09-06)
 
 #### Fixed
@@ -358,6 +77,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 
 - Fixed a typo in README.md
 
+<a name="5.2.0"></a>
+
 ## 5.2.0 (2022-08-27)
 
 #### Added
@@ -374,12 +95,16 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **quiz1**: Adjusted the explanations to be consistent with
   the tests
 
+<a name="5.1.1"></a>
+
 ## 5.1.1 (2022-08-17)
 
 #### Bug Fixes
 
 - Fixed an incorrect assertion in options1
 
+<a name="5.1.0"></a>
+
 ## 5.1.0 (2022-08-16)
 
 #### Features
@@ -414,6 +139,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Clarified manual installation instructions using `cargo install --path .`
 - Added a link to our Zulip in the readme file
 
+<a name="5.0.0"></a>
+
 ## 5.0.0 (2022-07-16)
 
 #### Features
@@ -486,6 +213,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Updated spacing in Cargo.toml.
 - Added a GitHub actions config so that tests run on every PR/commit.
 
+<a name="4.8.0"></a>
+
 ## 4.8.0 (2022-07-01)
 
 #### Features
@@ -506,6 +235,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Replaced the git.io URL with the fully qualified URL because of git.io's sunsetting.
 - Removed the deprecated Rust GitPod extension.
 
+<a name="4.7.1"></a>
+
 ## 4.7.1 (2022-04-20)
 
 #### Features
@@ -526,6 +257,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - The changelog will now be manually written instead of being automatically generated by the
   Git log.
 
+<a name="4.7.0"></a>
+
 ## 4.7.0 (2022-04-14)
 
 #### Features
@@ -566,6 +299,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Add hints on how to get GCC installed (#741) ([bc56861](https://github.com/rust-lang/rustlings/commit/bc5686174463ad6f4f6b824b0e9b97c3039d4886))
 - Fix some code blocks that were not highlighted ([17f9d74](https://github.com/rust-lang/rustlings/commit/17f9d7429ccd133a72e815fb5618e0ce79560929))
 
+<a name="4.6.0"></a>
+
 ## 4.6.0 (2021-09-25)
 
 #### Features
@@ -588,6 +323,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
   - Clarify instructions ([df25684c](https://github.com/rust-lang/rustlings/commit/df25684cb79f8413915e00b5efef29369849cef1))
 - **quiz1:** Fix inconsistent wording (#826) ([03131a3d](https://github.com/rust-lang/rustlings/commit/03131a3d35d9842598150f9da817f7cc26e2669a))
 
+<a name="4.5.0"></a>
+
 ## 4.5.0 (2021-07-07)
 
 #### Features
@@ -608,6 +345,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **try_from_into, from_str:** hints for dyn Error ([11d2cf0d](https://github.com/rust-lang/rustlings/commit/11d2cf0d604dee3f5023c17802d69438e69fa50e))
 - **variables5:** confine the answer further ([48ffcbd2](https://github.com/rust-lang/rustlings/commit/48ffcbd2c4cc4d936c2c7480019190f179813cc5))
 
+<a name="4.4.0"></a>
+
 ## 4.4.0 (2021-04-24)
 
 #### Bug Fixes
@@ -649,6 +388,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
   - updated progress percentage ([1c6f7e4b](https://github.com/rust-lang/rustlings/commit/1c6f7e4b7b9b3bd36f4da2bb2b69c549cc8bd913))
   - added progress info ([c0e3daac](https://github.com/rust-lang/rustlings/commit/c0e3daacaf6850811df5bc57fa43e0f249d5cfa4))
 
+<a name="4.3.0"></a>
+
 ## 4.3.0 (2020-12-29)
 
 #### Features
@@ -671,6 +412,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
   - Update description (#584) ([96347df9](https://github.com/rust-lang/rustlings/commit/96347df9df294f01153b29d9ad4ba361f665c755))
 - **vec1:** Have test compare every element in a and v ([9b6c6293](https://github.com/rust-lang/rustlings/commit/9b6c629397b24b944f484f5b2bbd8144266b5695))
 
+<a name="4.2.0"></a>
+
 ## 4.2.0 (2020-11-07)
 
 #### Features
@@ -691,6 +434,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
   - missing comma in test ([4fb230da](https://github.com/rust-lang/rustlings/commit/4fb230daf1251444fcf29e085cee222a91f8a37e))
 - **quiz3:** Second test is for odd numbers, not even. (#553) ([18e0bfef](https://github.com/rust-lang/rustlings/commit/18e0bfef1de53071e353ba1ec5837002ff7290e6))
 
+<a name="4.1.0"></a>
+
 ## 4.1.0 (2020-10-05)
 
 #### Bug Fixes
@@ -713,6 +458,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **cli:** Added 'cls' command to 'watch' mode (#474) ([4f2468e1](https://github.com/rust-lang/rustlings/commit/4f2468e14f574a93a2e9b688367b5752ed96ae7b))
 - **try_from_into:** Add insufficient length test (#469) ([523d18b8](https://github.com/rust-lang/rustlings/commit/523d18b873a319f7c09262f44bd40e2fab1830e5))
 
+<a name="4.0.0"></a>
+
 ## 4.0.0 (2020-07-08)
 
 #### Breaking Changes
@@ -754,6 +501,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **test2:** name of type String and &str (#394) ([d6c0a688](https://github.com/rust-lang/rustlings/commit/d6c0a688e6a96f93ad60d540d4b326f342fc0d45))
 - **variables6:** minor typo (#419) ([524e17df](https://github.com/rust-lang/rustlings/commit/524e17df10db95f7b90a0f75cc8997182a8a4094))
 
+<a name="3.0.0"></a>
+
 ## 3.0.0 (2020-04-11)
 
 #### Breaking Changes
@@ -776,6 +525,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - add new exercises for generics (#280) ([76be5e4e](https://github.com/rust-lang/rustlings/commit/76be5e4e991160f5fd9093f03ee2ba260e8f7229))
 - **ci:** add buildkite config ([b049fa2c](https://github.com/rust-lang/rustlings/commit/b049fa2c84dba0f0c8906ac44e28fd45fba51a71))
 
+<a name="2.2.1"></a>
+
 ### 2.2.1 (2020-02-27)
 
 #### Bug Fixes
@@ -786,11 +537,13 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 
 - Add clippy lints (#269) ([1e2fd9c9](https://github.com/rust-lang/rustlings/commit/1e2fd9c92f8cd6e389525ca1a999fca4c90b5921))
 
+<a name="2.2.0"></a>
+
 ## 2.2.0 (2020-02-25)
 
 #### Bug Fixes
 
-- Update deps to version compatible with aarch64-pc-windows (#263) ([19a93428](https://github.com/rust-lang/rustlings/commit/19a93428b3c73d994292671f829bdc8e5b7b3401))
+- Update deps to version compatable with aarch64-pc-windows (#263) ([19a93428](https://github.com/rust-lang/rustlings/commit/19a93428b3c73d994292671f829bdc8e5b7b3401))
 - **docs:**
   - Added a necessary step to Windows installation process (#242) ([3906efcd](https://github.com/rust-lang/rustlings/commit/3906efcd52a004047b460ed548037093de3f523f))
   - Fixed mangled sentence from book; edited for clarity (#266) ([ade52ff](https://github.com/rust-lang/rustlings/commit/ade52ffb739987287ddd5705944c8777705faed9))
@@ -813,6 +566,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Added traits exercises (#274 but specifically #216, which originally added
   this :heart:) ([b559cdd](https://github.com/rust-lang/rustlings/commit/b559cdd73f32c0d0cfc1feda39f82b3e3583df17))
 
+<a name="2.1.0"></a>
+
 ## 2.1.0 (2019-11-27)
 
 #### Bug Fixes
@@ -830,6 +585,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 
 - **watch:** show hint while watching ([8143d57b](https://github.com/rust-lang/rustlings/commit/8143d57b4e88c51341dd4a18a14c536042cc009c))
 
+<a name="2.0.0"></a>
+
 ## 2.0.0 (2019-11-12)
 
 #### Bug Fixes
@@ -850,6 +607,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **cli:** check for rustc before doing anything ([36a033b8](https://github.com/rust-lang/rustlings/commit/36a033b87a6549c1e5639c908bf7381c84f4f425))
 - **hint:** Add test for hint ([ce9fa6eb](https://github.com/rust-lang/rustlings/commit/ce9fa6ebbfdc3e7585d488d9409797285708316f))
 
+<a name="1.5.1"></a>
+
 ### 1.5.1 (2019-11-11)
 
 #### Bug Fixes
@@ -861,6 +620,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **threads:** Move Threads behind SLT ([fbe91a67](https://github.com/rust-lang/rustlings/commit/fbe91a67a482bfe64cbcdd58d06ba830a0f39da3), closes [#205](https://github.com/rust-lang/rustlings/issues/205))
 - **watch:** clear screen before each `verify()` ([3aff590](https://github.com/rust-lang/rustlings/commit/3aff59085586c24196a547c2693adbdcf4432648))
 
+<a name="1.5.0"></a>
+
 ## 1.5.0 (2019-11-09)
 
 #### Bug Fixes
@@ -885,6 +646,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Added exercise for struct update syntax ([1c4c8764](https://github.com/rust-lang/rustlings/commit/1c4c8764ed118740cd4cee73272ddc6cceb9d959))
 - **iterators2:** adds iterators2 exercise including config ([9288fccf](https://github.com/rust-lang/rustlings/commit/9288fccf07a2c5043b76d0fd6491e4cf72d76031))
 
+<a name="1.4.1"></a>
+
 ### 1.4.1 (2019-08-13)
 
 #### Bug Fixes
@@ -893,6 +656,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **option1:** Add test for prematurely passing exercise ([a750e4a1](https://github.com/rust-lang/rustlings/commit/a750e4a1a3006227292bb17d57d78ce84da6bfc6))
 - **test1:** Swap assertion parameter order ([4086d463](https://github.com/rust-lang/rustlings/commit/4086d463a981e81d97781851d17db2ced290f446))
 
+<a name="1.4.0"></a>
+
 ## 1.4.0 (2019-07-13)
 
 #### Bug Fixes
@@ -909,6 +674,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - **changelog:** Use clog for changelogs ([34e31232](https://github.com/rust-lang/rustlings/commit/34e31232dfddde284a341c9609b33cd27d9d5724))
 - **iterators2:** adds iterators2 exercise including config ([9288fccf](https://github.com/rust-lang/rustlings/commit/9288fccf07a2c5043b76d0fd6491e4cf72d76031))
 
+<a name="1.3.0"></a>
+
 ### 1.3.0 (2019-06-05)
 
 #### Features
@@ -924,12 +691,16 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Fix broken link (#164, @HanKruiger)
 - Remove highlighting and syntect (#167, @komaeda)
 
+<a name="1.2.2"></a>
+
 ### 1.2.2 (2019-05-07)
 
 #### Bug Fixes
 
 - Reverted `--nocapture` flag since it was causing tests to pass unconditionally
 
+<a name="1.2.1"></a>
+
 ### 1.2.1 (2019-04-22)
 
 #### Bug Fixes
@@ -937,6 +708,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Fix the `--nocapture` feature (@komaeda)
 - Provide a nicer error message for when you're in the wrong directory
 
+<a name="1.2.0"></a>
+
 ### 1.2.0 (2019-04-22)
 
 #### Features
@@ -944,6 +717,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Add errors to exercises that compile without user changes (@yvan-sraka)
 - Use --nocapture when testing, enabling `println!` when running (@komaeda)
 
+<a name="1.1.1"></a>
+
 ### 1.1.1 (2019-04-14)
 
 #### Bug fixes
@@ -956,6 +731,8 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Fix links by deleting book version (@diodfr, #142)
 - Canonicalize paths to fix path matching (@cjpearce, #143)
 
+<a name="1.1.0"></a>
+
 ### 1.1.0 (2019-03-20)
 
 - errors2.rs: update link to Rust book (#124)
@@ -965,12 +742,16 @@ Then follow the link to the guide about [community exercises](https://rustlings.
 - Give a warning when Rustlings isn't run from the right directory (#123)
 - Verify that rust version is recent enough to install Rustlings (#131)
 
+<a name="1.0.1"></a>
+
 ### 1.0.1 (2019-03-06)
 
 - Adds a way to install Rustlings in one command (`curl -L https://git.io/rustlings | bash`)
 - Makes `rustlings watch` react to create file events (@shaunbennett, #117)
 - Reworks the exercise management to use an external TOML file instead of just listing them in the code
 
+<a name="1.0.0"></a>
+
 ### 1.0.0 (2019-03-06)
 
 Initial release.

CONTRIBUTING.md

@@ -1,61 +1,130 @@
-# Contributing to Rustlings
+## Contributing to Rustlings
 
-First off, thanks for taking the time to contribute! ❤️
+First off, thanks for taking the time to contribute!! ❤️
 
-## Quick Reference
+### Quick Reference
 
-I want to …
+I want to...
 
-- _report a bug!_ ➡️ [open an issue](#issues)
-- _fix a bug!_ ➡️ [open a pull request](#pull-requests)
-- _implement a new feature!_ ➡️ [open an issue to discuss it first, then a pull request](#issues)
-- _add an exercise!_ ➡️ [read this](#adding-an-exercise)
-- _update an outdated exercise!_ ➡️ [open a pull request](#pull-requests)
+_add an exercise! ➡️ [read this](#addex) and then [open a Pull Request](#prs)_
 
-## Issues
+_update an outdated exercise! ➡️ [open a Pull Request](#prs)_
+
+_report a bug! ➡️ [open an Issue](#issues)_
+
+_fix a bug! ➡️ [open a Pull Request](#prs)_
+
+_implement a new feature! ➡️ [open an Issue to discuss it first, then a Pull Request](#issues)_
+
+<a name="#src"></a>
+### Working on the source code
+
+`rustlings` is basically a glorified `rustc` wrapper. Therefore the source code
+isn't really that complicated since the bulk of the work is done by `rustc`.
+`src/main.rs` contains a simple `argh` CLI that connects to most of the other source files.
+
+<a name="addex"></a>
+### Adding an exercise
+
+The first step is to add the exercise! Name the file `exercises/yourTopic/yourTopicN.rs`, make sure to
+put in some helpful links, and link to sections of the book in `exercises/yourTopic/README.md`.
+
+Next make sure it runs with `rustlings`. The exercise metadata is stored in `info.toml`, under the `exercises` array. The order of the `exercises` array determines the order the exercises are run by `rustlings verify` and `rustlings watch`.
+
+Add the metadata for your exercise in the correct order in the `exercises` array. If you are unsure of the correct ordering, add it at the bottom and ask in your pull request. The exercise metadata should contain the following:
+```diff
+  ...
++ [[exercises]]
++ name = "yourTopicN"
++ path = "exercises/yourTopic/yourTopicN.rs"
++ mode = "compile"
++ hint = """
++ Some kind of useful hint for your exercise."""
+  ...
+```
+
+The `mode` attribute decides whether Rustlings will only compile your exercise, or compile and test it. If you have tests to verify in your exercise, choose `test`, otherwise `compile`. If you're working on a Clippy exercise, use `mode = "clippy"`.
+
+That's all! Feel free to put up a pull request.
+
+<a name="issues"></a>
+### Issues
 
 You can open an issue [here](https://github.com/rust-lang/rustlings/issues/new).
 If you're reporting a bug, please include the output of the following commands:
 
-- `cargo --version`
+- `rustc --version`
 - `rustlings --version`
 - `ls -la`
 - Your OS name and version
 
-## Pull Requests
+<a name="prs"></a>
+### Pull Requests
 
-You are welcome to open a pull request, but unless it is small and trivial, **please open an issue to discuss your idea first** 🙏🏼
+Opening a pull request is as easy as forking the repository and committing your
+changes. There's a couple of things to watch out for:
 
-Opening a pull request is as easy as forking the repository and committing your changes.
-If you need any help with it or face any Git related problems, don't hesitate to ask for help 🤗
+#### Write correct commit messages
 
-It may take time to review your pull request.
-Please be patient 😇
+We follow the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0-beta.4/)
+specification.
+This means that you have to format your commit messages in a specific way. Say
+you're working on adding a new exercise called `foobar1.rs`. You could write
+the following commit message:
 
-When updating an exercise, check if its solution needs to be updated.
-
-## Adding An Exercise
-
-- Name the file `exercises/yourTopic/yourTopicN.rs`.
-- Make sure to put in some helpful links, and link to sections of The Book in `exercises/yourTopic/README.md`.
-- In the exercise, add a `// TODO: …` comment where user changes are required.
-- Add a solution at `solutions/yourTopic/yourTopicN.rs` with comments explaining it.
-- Add the [metadata for your exercise](#exercise-metadata) in the `rustlings-macros/info.toml` file.
-- Make sure your exercise runs with `rustlings run yourTopicN`.
-- [Open a pull request](#pull-requests).
-
-### Exercise Metadata
-
-The exercise metadata should contain the following:
-
-```toml
-[[exercises]]
-name = "yourTopicN"
-dir = "yourTopic"
-hint = """
-A useful (multi-line) hint for your exercise.
-Include links to a section in The Book or a documentation page."""
+```
+feat: add foobar1.rs exercise
 ```
 
-If your exercise doesn't contain any test, add `test = false` to the exercise metadata.
-But adding tests is recommended.
+If you're just fixing a bug, please use the `fix` type:
+
+```
+fix(verify): make sure verify doesn't self-destruct
+```
+
+The scope within the brackets is optional, but should be any of these:
+
+- `installation` (for the installation script)
+- `cli` (for general CLI changes)
+- `verify` (for the verification source file)
+- `watch` (for the watch functionality source)
+- `run` (for the run functionality source)
+- `EXERCISENAME` (if you're changing a specific exercise, or set of exercises,
+  substitute them here)
+
+When the commit also happens to close an existing issue, link it in the message
+body:
+
+```
+fix: update foobar
+
+closes #101029908
+```
+
+If you're doing simple changes, like updating a book link, use `chore`:
+
+```
+chore: update exercise1.rs book link
+```
+
+If you're updating documentation, use `docs`:
+
+```
+docs: add more information to Readme
+```
+
+If, and only if, you're absolutely sure you want to make a breaking change
+(please discuss this beforehand!), add an exclamation mark to the type and
+explain the breaking change in the message body:
+
+```
+fix!: completely change verification
+
+BREAKING CHANGE: This has to be done because lorem ipsum dolor
+```
+
+#### Pull Request Workflow
+
+Once you open a Pull Request, it may be reviewed or labeled (or both) until
+the maintainers accept your change. Please be patient, it may take some time
+for this to happen!

Cargo.toml

@@ -1,88 +1,29 @@
-[workspace]
-resolver = "2"
-exclude = [
-  "tests/test_exercises",
-  "dev",
-]
-
-[workspace.package]
-version = "6.4.0"
-authors = [
-  "Mo Bitar <mo8it@proton.me>", # https://github.com/mo8it
-  "Liv <mokou@fastmail.com>", # https://github.com/shadows-withal
-  # Alumni
-  "Carol (Nichols || Goulding) <carol.nichols@gmail.com>", # https://github.com/carols10cents
-]
-repository = "https://github.com/rust-lang/rustlings"
-license = "MIT"
-edition = "2024" # On Update: Update the edition of `rustfmt` in `dev check` and `CARGO_TOML` in `dev new`.
-rust-version = "1.87"
-
-[workspace.dependencies]
-serde = { version = "1.0", features = ["derive"] }
-toml_edit = { version = "0.22", default-features = false, features = ["parse", "serde"] }
-
 [package]
 name = "rustlings"
-description = "Small exercises to get you used to reading and writing Rust code!"
-version.workspace = true
-authors.workspace = true
-repository.workspace = true
-license.workspace = true
-edition.workspace = true
-rust-version.workspace = true
-keywords = [
-  "exercise",
-  "learning",
-]
-include = [
-  "/src/",
-  "/exercises/",
-  "/solutions/",
-  # A symlink to be able to include `dev/Cargo.toml` although `dev` is excluded.
-  "/dev-Cargo.toml",
-  "/README.md",
-  "/LICENSE",
+version = "5.4.0"
+authors = [
+  "Liv <mokou@fastmail.com>",
+  "Carol (Nichols || Goulding) <carol.nichols@gmail.com>",
 ]
+edition = "2021"
 
 [dependencies]
-anyhow = "1.0"
-clap = { version = "4.5", features = ["derive"] }
-crossterm = { version = "0.29", default-features = false, features = ["windows", "events"] }
-notify = "8.0"
-rustlings-macros = { path = "rustlings-macros", version = "=6.4.0" }
-serde_json = "1.0"
-serde.workspace = true
-toml_edit.workspace = true
+argh = "0.1"
+indicatif = "0.16"
+console = "0.15"
+notify = "4.0"
+toml = "0.5"
+regex = "1.5"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0.81"
+home = "0.5.3"
+glob = "0.3.0"
 
-[target.'cfg(not(windows))'.dependencies]
-rustix = { version = "1.0", default-features = false, features = ["std", "stdio", "termios"] }
+[[bin]]
+name = "rustlings"
+path = "src/main.rs"
 
 [dev-dependencies]
-tempfile = "3.19"
-
-[profile.release]
-panic = "abort"
-
-[profile.dev]
-panic = "abort"
-
-[package.metadata.release]
-pre-release-hook = ["./release-hook.sh"]
-pre-release-commit-message = "Release 🎉"
-
-[workspace.lints.rust]
-unsafe_code = "forbid"
-unstable_features = "forbid"
-
-[workspace.lints.clippy]
-empty_loop = "forbid"
-disallowed-types = "deny"
-disallowed-methods = "deny"
-infinite_loop = "deny"
-mem_forget = "deny"
-dbg_macro = "warn"
-todo = "warn"
-
-[lints]
-workspace = true
+assert_cmd = "0.11.0"
+predicates = "1.0.1"
+glob = "0.3.0"

README.md

@@ -1,7 +1,177 @@
-# [Rustlings](https://rustlings.rust-lang.org) 🦀
+# rustlings 🦀❤️
 
-Small exercises to get you used to reading and writing [Rust](https://www.rust-lang.org) code - _Recommended in parallel to reading [the official Rust book](https://doc.rust-lang.org/book) 📚️_
+Greetings and welcome to `rustlings`. This project contains small exercises to get you used to reading and writing Rust code. This includes reading and responding to compiler messages!
 
-Visit the **website** for a demo, info about setup and more:
+_...looking for the old, web-based version of Rustlings? Try [here](https://github.com/rust-lang/rustlings/tree/rustlings-1)_
 
-## ➡️ [rustlings.rust-lang.org](https://rustlings.rust-lang.org) ⬅️
+Alternatively, for a first-time Rust learner, there are several other resources:
+
+- [The Book](https://doc.rust-lang.org/book/index.html) - The most comprehensive resource for learning Rust, but a bit theoretical sometimes. You will be using this along with Rustlings!
+- [Rust By Example](https://doc.rust-lang.org/rust-by-example/index.html) - Learn Rust by solving little exercises! It's almost like `rustlings`, but online
+
+## Getting Started
+
+_Note: If you're on MacOS, make sure you've installed Xcode and its developer tools by typing `xcode-select --install`._
+_Note: If you're on Linux, make sure you've installed gcc. Deb: `sudo apt install gcc`. Yum: `sudo yum -y install gcc`._
+
+You will need to have Rust installed. You can get it by visiting https://rustup.rs. This'll also install Cargo, Rust's package/project manager.
+
+## MacOS/Linux
+
+Just run:
+
+```bash
+curl -L https://raw.githubusercontent.com/rust-lang/rustlings/main/install.sh | bash
+# Or if you want it to be installed to a different path:
+curl -L https://raw.githubusercontent.com/rust-lang/rustlings/main/install.sh | bash -s mypath/
+```
+
+This will install Rustlings and give you access to the `rustlings` command. Run it to get started!
+
+### Nix
+
+Basically: Clone the repository at the latest tag, finally run `nix develop` or `nix-shell`.
+
+```bash
+# find out the latest version at https://github.com/rust-lang/rustlings/releases/latest (on edit 5.4.0)
+git clone -b 5.4.0 --depth 1 https://github.com/rust-lang/rustlings
+cd rustlings
+# if nix version > 2.3
+nix develop
+# if nix version <= 2.3
+nix-shell
+```
+
+## Windows
+
+In PowerShell (Run as Administrator), set `ExecutionPolicy` to `RemoteSigned`:
+
+```ps1
+Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
+```
+
+Then, you can run:
+
+```ps1
+Start-BitsTransfer -Source https://raw.githubusercontent.com/rust-lang/rustlings/main/install.ps1 -Destination $env:TMP/install_rustlings.ps1; Unblock-File $env:TMP/install_rustlings.ps1; Invoke-Expression $env:TMP/install_rustlings.ps1
+```
+
+To install Rustlings. Same as on MacOS/Linux, you will have access to the `rustlings` command after it. Keep in mind that this works best in PowerShell, and any other terminals may give you errors.
+
+If you get a permission denied message, you might have to exclude the directory where you cloned Rustlings in your antivirus.
+
+## Browser
+
+[Run on Repl.it](https://repl.it/github/rust-lang/rustlings)
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/rust-lang/rustlings)
+
+## Manually
+
+Basically: Clone the repository at the latest tag, run `cargo install --path .`.
+
+```bash
+# find out the latest version at https://github.com/rust-lang/rustlings/releases/latest (on edit 5.4.0)
+git clone -b 5.4.0 --depth 1 https://github.com/rust-lang/rustlings
+cd rustlings
+cargo install --force --path .
+```
+
+If there are installation errors, ensure that your toolchain is up to date. For the latest, run:
+
+```bash
+rustup update
+```
+
+Then, same as above, run `rustlings` to get started.
+
+## Doing exercises
+
+The exercises are sorted by topic and can be found in the subdirectory `rustlings/exercises/<topic>`. For every topic there is an additional README file with some resources to get you started on the topic. We really recommend that you have a look at them before you start.
+
+The task is simple. Most exercises contain an error that keeps them from compiling, and it's up to you to fix it! Some exercises are also run as tests, but rustlings handles them all the same. To run the exercises in the recommended order, execute:
+
+```bash
+rustlings watch
+```
+
+This will try to verify the completion of every exercise in a predetermined order (what we think is best for newcomers). It will also rerun automatically every time you change a file in the `exercises/` directory. If you want to only run it once, you can use:
+
+```bash
+rustlings verify
+```
+
+This will do the same as watch, but it'll quit after running.
+
+In case you want to go by your own order, or want to only verify a single exercise, you can run:
+
+```bash
+rustlings run myExercise1
+```
+
+Or simply use the following command to run the next unsolved exercise in the course:
+
+```bash
+rustlings run next
+```
+
+In case you get stuck, you can run the following command to get a hint for your
+exercise:
+
+```bash
+rustlings hint myExercise1
+```
+
+You can also get the hint for the next unsolved exercise with the following command:
+
+```bash
+rustlings hint next
+```
+
+To check your progress, you can run the following command:
+
+```bash
+rustlings list
+```
+
+## Testing yourself
+
+After every couple of sections, there will be a quiz that'll test your knowledge on a bunch of sections at once. These quizzes are found in `exercises/quizN.rs`.
+
+## Enabling `rust-analyzer`
+
+Run the command `rustlings lsp` which will generate a `rust-project.json` at the root of the project, this allows [rust-analyzer](https://rust-analyzer.github.io/) to parse each exercise.
+
+## Continuing On
+
+Once you've completed Rustlings, put your new knowledge to good use! Continue practicing your Rust skills by building your own projects, contributing to Rustlings, or finding other open-source projects to contribute to.
+
+## Uninstalling Rustlings
+
+If you want to remove Rustlings from your system, there are two steps. First, you'll need to remove the exercises folder that the install script created
+for you:
+
+```bash
+rm -rf rustlings # or your custom folder name, if you chose and or renamed it
+```
+
+Second, since Rustlings got installed via `cargo install`, it's only reasonable to assume that you can also remove it using Cargo, and
+exactly that is the case. Run `cargo uninstall` to remove the `rustlings` binary:
+
+```bash
+cargo uninstall rustlings
+```
+
+Now you should be done!
+
+## Contributing
+
+See [CONTRIBUTING.md](./CONTRIBUTING.md).
+
+Development-focused discussion about Rustlings happens in the [**rustlings** stream](https://rust-lang.zulipchat.com/#narrow/stream/334454-rustlings)
+on the [Rust Project Zulip](https://rust-lang.zulipchat.com). Feel free to start a new thread there
+if you have ideas or suggestions!
+
+## Contributors ✨
+
+Thanks goes to the wonderful people listed in [AUTHORS.md](./AUTHORS.md) 🎉

build.rs

@@ -1,5 +0,0 @@
-fn main() {
-    // Fix building from source on Windows because it can't handle file links.
-    #[cfg(windows)]
-    let _ = std::fs::copy("dev/Cargo.toml", "dev-Cargo.toml");
-}

clippy.toml

@@ -1,15 +0,0 @@
-disallowed-types = [
-  # Inefficient. Use `.queue(…)` instead.
-  "crossterm::style::Stylize",
-  "crossterm::style::styled_content::StyledContent",
-]
-
-disallowed-methods = [
-  # Inefficient. Use `.queue(…)` instead.
-  "crossterm::style::style",
-  # Use `thread::Builder::spawn` instead and handle the error.
-  "std::thread::spawn",
-  "std::thread::Scope::spawn",
-  # Return `ExitCode` instead.
-  "std::process::exit",
-]

dev-Cargo.toml

@@ -1 +0,0 @@
-dev/Cargo.toml

dev/Cargo.toml

@@ -1,223 +0,0 @@
-# Don't edit the `bin` list manually! It is updated by `cargo dev update`. This comment line will be stripped in `rustlings init`.
-bin = [
-  { name = "intro1", path = "../exercises/00_intro/intro1.rs" },
-  { name = "intro1_sol", path = "../solutions/00_intro/intro1.rs" },
-  { name = "intro2", path = "../exercises/00_intro/intro2.rs" },
-  { name = "intro2_sol", path = "../solutions/00_intro/intro2.rs" },
-  { name = "variables1", path = "../exercises/01_variables/variables1.rs" },
-  { name = "variables1_sol", path = "../solutions/01_variables/variables1.rs" },
-  { name = "variables2", path = "../exercises/01_variables/variables2.rs" },
-  { name = "variables2_sol", path = "../solutions/01_variables/variables2.rs" },
-  { name = "variables3", path = "../exercises/01_variables/variables3.rs" },
-  { name = "variables3_sol", path = "../solutions/01_variables/variables3.rs" },
-  { name = "variables4", path = "../exercises/01_variables/variables4.rs" },
-  { name = "variables4_sol", path = "../solutions/01_variables/variables4.rs" },
-  { name = "variables5", path = "../exercises/01_variables/variables5.rs" },
-  { name = "variables5_sol", path = "../solutions/01_variables/variables5.rs" },
-  { name = "variables6", path = "../exercises/01_variables/variables6.rs" },
-  { name = "variables6_sol", path = "../solutions/01_variables/variables6.rs" },
-  { name = "functions1", path = "../exercises/02_functions/functions1.rs" },
-  { name = "functions1_sol", path = "../solutions/02_functions/functions1.rs" },
-  { name = "functions2", path = "../exercises/02_functions/functions2.rs" },
-  { name = "functions2_sol", path = "../solutions/02_functions/functions2.rs" },
-  { name = "functions3", path = "../exercises/02_functions/functions3.rs" },
-  { name = "functions3_sol", path = "../solutions/02_functions/functions3.rs" },
-  { name = "functions4", path = "../exercises/02_functions/functions4.rs" },
-  { name = "functions4_sol", path = "../solutions/02_functions/functions4.rs" },
-  { name = "functions5", path = "../exercises/02_functions/functions5.rs" },
-  { name = "functions5_sol", path = "../solutions/02_functions/functions5.rs" },
-  { name = "if1", path = "../exercises/03_if/if1.rs" },
-  { name = "if1_sol", path = "../solutions/03_if/if1.rs" },
-  { name = "if2", path = "../exercises/03_if/if2.rs" },
-  { name = "if2_sol", path = "../solutions/03_if/if2.rs" },
-  { name = "if3", path = "../exercises/03_if/if3.rs" },
-  { name = "if3_sol", path = "../solutions/03_if/if3.rs" },
-  { name = "quiz1", path = "../exercises/quizzes/quiz1.rs" },
-  { name = "quiz1_sol", path = "../solutions/quizzes/quiz1.rs" },
-  { name = "primitive_types1", path = "../exercises/04_primitive_types/primitive_types1.rs" },
-  { name = "primitive_types1_sol", path = "../solutions/04_primitive_types/primitive_types1.rs" },
-  { name = "primitive_types2", path = "../exercises/04_primitive_types/primitive_types2.rs" },
-  { name = "primitive_types2_sol", path = "../solutions/04_primitive_types/primitive_types2.rs" },
-  { name = "primitive_types3", path = "../exercises/04_primitive_types/primitive_types3.rs" },
-  { name = "primitive_types3_sol", path = "../solutions/04_primitive_types/primitive_types3.rs" },
-  { name = "primitive_types4", path = "../exercises/04_primitive_types/primitive_types4.rs" },
-  { name = "primitive_types4_sol", path = "../solutions/04_primitive_types/primitive_types4.rs" },
-  { name = "primitive_types5", path = "../exercises/04_primitive_types/primitive_types5.rs" },
-  { name = "primitive_types5_sol", path = "../solutions/04_primitive_types/primitive_types5.rs" },
-  { name = "primitive_types6", path = "../exercises/04_primitive_types/primitive_types6.rs" },
-  { name = "primitive_types6_sol", path = "../solutions/04_primitive_types/primitive_types6.rs" },
-  { name = "vecs1", path = "../exercises/05_vecs/vecs1.rs" },
-  { name = "vecs1_sol", path = "../solutions/05_vecs/vecs1.rs" },
-  { name = "vecs2", path = "../exercises/05_vecs/vecs2.rs" },
-  { name = "vecs2_sol", path = "../solutions/05_vecs/vecs2.rs" },
-  { name = "move_semantics1", path = "../exercises/06_move_semantics/move_semantics1.rs" },
-  { name = "move_semantics1_sol", path = "../solutions/06_move_semantics/move_semantics1.rs" },
-  { name = "move_semantics2", path = "../exercises/06_move_semantics/move_semantics2.rs" },
-  { name = "move_semantics2_sol", path = "../solutions/06_move_semantics/move_semantics2.rs" },
-  { name = "move_semantics3", path = "../exercises/06_move_semantics/move_semantics3.rs" },
-  { name = "move_semantics3_sol", path = "../solutions/06_move_semantics/move_semantics3.rs" },
-  { name = "move_semantics4", path = "../exercises/06_move_semantics/move_semantics4.rs" },
-  { name = "move_semantics4_sol", path = "../solutions/06_move_semantics/move_semantics4.rs" },
-  { name = "move_semantics5", path = "../exercises/06_move_semantics/move_semantics5.rs" },
-  { name = "move_semantics5_sol", path = "../solutions/06_move_semantics/move_semantics5.rs" },
-  { name = "structs1", path = "../exercises/07_structs/structs1.rs" },
-  { name = "structs1_sol", path = "../solutions/07_structs/structs1.rs" },
-  { name = "structs2", path = "../exercises/07_structs/structs2.rs" },
-  { name = "structs2_sol", path = "../solutions/07_structs/structs2.rs" },
-  { name = "structs3", path = "../exercises/07_structs/structs3.rs" },
-  { name = "structs3_sol", path = "../solutions/07_structs/structs3.rs" },
-  { name = "enums1", path = "../exercises/08_enums/enums1.rs" },
-  { name = "enums1_sol", path = "../solutions/08_enums/enums1.rs" },
-  { name = "enums2", path = "../exercises/08_enums/enums2.rs" },
-  { name = "enums2_sol", path = "../solutions/08_enums/enums2.rs" },
-  { name = "enums3", path = "../exercises/08_enums/enums3.rs" },
-  { name = "enums3_sol", path = "../solutions/08_enums/enums3.rs" },
-  { name = "strings1", path = "../exercises/09_strings/strings1.rs" },
-  { name = "strings1_sol", path = "../solutions/09_strings/strings1.rs" },
-  { name = "strings2", path = "../exercises/09_strings/strings2.rs" },
-  { name = "strings2_sol", path = "../solutions/09_strings/strings2.rs" },
-  { name = "strings3", path = "../exercises/09_strings/strings3.rs" },
-  { name = "strings3_sol", path = "../solutions/09_strings/strings3.rs" },
-  { name = "strings4", path = "../exercises/09_strings/strings4.rs" },
-  { name = "strings4_sol", path = "../solutions/09_strings/strings4.rs" },
-  { name = "modules1", path = "../exercises/10_modules/modules1.rs" },
-  { name = "modules1_sol", path = "../solutions/10_modules/modules1.rs" },
-  { name = "modules2", path = "../exercises/10_modules/modules2.rs" },
-  { name = "modules2_sol", path = "../solutions/10_modules/modules2.rs" },
-  { name = "modules3", path = "../exercises/10_modules/modules3.rs" },
-  { name = "modules3_sol", path = "../solutions/10_modules/modules3.rs" },
-  { name = "hashmaps1", path = "../exercises/11_hashmaps/hashmaps1.rs" },
-  { name = "hashmaps1_sol", path = "../solutions/11_hashmaps/hashmaps1.rs" },
-  { name = "hashmaps2", path = "../exercises/11_hashmaps/hashmaps2.rs" },
-  { name = "hashmaps2_sol", path = "../solutions/11_hashmaps/hashmaps2.rs" },
-  { name = "hashmaps3", path = "../exercises/11_hashmaps/hashmaps3.rs" },
-  { name = "hashmaps3_sol", path = "../solutions/11_hashmaps/hashmaps3.rs" },
-  { name = "quiz2", path = "../exercises/quizzes/quiz2.rs" },
-  { name = "quiz2_sol", path = "../solutions/quizzes/quiz2.rs" },
-  { name = "options1", path = "../exercises/12_options/options1.rs" },
-  { name = "options1_sol", path = "../solutions/12_options/options1.rs" },
-  { name = "options2", path = "../exercises/12_options/options2.rs" },
-  { name = "options2_sol", path = "../solutions/12_options/options2.rs" },
-  { name = "options3", path = "../exercises/12_options/options3.rs" },
-  { name = "options3_sol", path = "../solutions/12_options/options3.rs" },
-  { name = "errors1", path = "../exercises/13_error_handling/errors1.rs" },
-  { name = "errors1_sol", path = "../solutions/13_error_handling/errors1.rs" },
-  { name = "errors2", path = "../exercises/13_error_handling/errors2.rs" },
-  { name = "errors2_sol", path = "../solutions/13_error_handling/errors2.rs" },
-  { name = "errors3", path = "../exercises/13_error_handling/errors3.rs" },
-  { name = "errors3_sol", path = "../solutions/13_error_handling/errors3.rs" },
-  { name = "errors4", path = "../exercises/13_error_handling/errors4.rs" },
-  { name = "errors4_sol", path = "../solutions/13_error_handling/errors4.rs" },
-  { name = "errors5", path = "../exercises/13_error_handling/errors5.rs" },
-  { name = "errors5_sol", path = "../solutions/13_error_handling/errors5.rs" },
-  { name = "errors6", path = "../exercises/13_error_handling/errors6.rs" },
-  { name = "errors6_sol", path = "../solutions/13_error_handling/errors6.rs" },
-  { name = "generics1", path = "../exercises/14_generics/generics1.rs" },
-  { name = "generics1_sol", path = "../solutions/14_generics/generics1.rs" },
-  { name = "generics2", path = "../exercises/14_generics/generics2.rs" },
-  { name = "generics2_sol", path = "../solutions/14_generics/generics2.rs" },
-  { name = "traits1", path = "../exercises/15_traits/traits1.rs" },
-  { name = "traits1_sol", path = "../solutions/15_traits/traits1.rs" },
-  { name = "traits2", path = "../exercises/15_traits/traits2.rs" },
-  { name = "traits2_sol", path = "../solutions/15_traits/traits2.rs" },
-  { name = "traits3", path = "../exercises/15_traits/traits3.rs" },
-  { name = "traits3_sol", path = "../solutions/15_traits/traits3.rs" },
-  { name = "traits4", path = "../exercises/15_traits/traits4.rs" },
-  { name = "traits4_sol", path = "../solutions/15_traits/traits4.rs" },
-  { name = "traits5", path = "../exercises/15_traits/traits5.rs" },
-  { name = "traits5_sol", path = "../solutions/15_traits/traits5.rs" },
-  { name = "quiz3", path = "../exercises/quizzes/quiz3.rs" },
-  { name = "quiz3_sol", path = "../solutions/quizzes/quiz3.rs" },
-  { name = "lifetimes1", path = "../exercises/16_lifetimes/lifetimes1.rs" },
-  { name = "lifetimes1_sol", path = "../solutions/16_lifetimes/lifetimes1.rs" },
-  { name = "lifetimes2", path = "../exercises/16_lifetimes/lifetimes2.rs" },
-  { name = "lifetimes2_sol", path = "../solutions/16_lifetimes/lifetimes2.rs" },
-  { name = "lifetimes3", path = "../exercises/16_lifetimes/lifetimes3.rs" },
-  { name = "lifetimes3_sol", path = "../solutions/16_lifetimes/lifetimes3.rs" },
-  { name = "tests1", path = "../exercises/17_tests/tests1.rs" },
-  { name = "tests1_sol", path = "../solutions/17_tests/tests1.rs" },
-  { name = "tests2", path = "../exercises/17_tests/tests2.rs" },
-  { name = "tests2_sol", path = "../solutions/17_tests/tests2.rs" },
-  { name = "tests3", path = "../exercises/17_tests/tests3.rs" },
-  { name = "tests3_sol", path = "../solutions/17_tests/tests3.rs" },
-  { name = "iterators1", path = "../exercises/18_iterators/iterators1.rs" },
-  { name = "iterators1_sol", path = "../solutions/18_iterators/iterators1.rs" },
-  { name = "iterators2", path = "../exercises/18_iterators/iterators2.rs" },
-  { name = "iterators2_sol", path = "../solutions/18_iterators/iterators2.rs" },
-  { name = "iterators3", path = "../exercises/18_iterators/iterators3.rs" },
-  { name = "iterators3_sol", path = "../solutions/18_iterators/iterators3.rs" },
-  { name = "iterators4", path = "../exercises/18_iterators/iterators4.rs" },
-  { name = "iterators4_sol", path = "../solutions/18_iterators/iterators4.rs" },
-  { name = "iterators5", path = "../exercises/18_iterators/iterators5.rs" },
-  { name = "iterators5_sol", path = "../solutions/18_iterators/iterators5.rs" },
-  { name = "box1", path = "../exercises/19_smart_pointers/box1.rs" },
-  { name = "box1_sol", path = "../solutions/19_smart_pointers/box1.rs" },
-  { name = "rc1", path = "../exercises/19_smart_pointers/rc1.rs" },
-  { name = "rc1_sol", path = "../solutions/19_smart_pointers/rc1.rs" },
-  { name = "arc1", path = "../exercises/19_smart_pointers/arc1.rs" },
-  { name = "arc1_sol", path = "../solutions/19_smart_pointers/arc1.rs" },
-  { name = "cow1", path = "../exercises/19_smart_pointers/cow1.rs" },
-  { name = "cow1_sol", path = "../solutions/19_smart_pointers/cow1.rs" },
-  { name = "threads1", path = "../exercises/20_threads/threads1.rs" },
-  { name = "threads1_sol", path = "../solutions/20_threads/threads1.rs" },
-  { name = "threads2", path = "../exercises/20_threads/threads2.rs" },
-  { name = "threads2_sol", path = "../solutions/20_threads/threads2.rs" },
-  { name = "threads3", path = "../exercises/20_threads/threads3.rs" },
-  { name = "threads3_sol", path = "../solutions/20_threads/threads3.rs" },
-  { name = "macros1", path = "../exercises/21_macros/macros1.rs" },
-  { name = "macros1_sol", path = "../solutions/21_macros/macros1.rs" },
-  { name = "macros2", path = "../exercises/21_macros/macros2.rs" },
-  { name = "macros2_sol", path = "../solutions/21_macros/macros2.rs" },
-  { name = "macros3", path = "../exercises/21_macros/macros3.rs" },
-  { name = "macros3_sol", path = "../solutions/21_macros/macros3.rs" },
-  { name = "macros4", path = "../exercises/21_macros/macros4.rs" },
-  { name = "macros4_sol", path = "../solutions/21_macros/macros4.rs" },
-  { name = "clippy1", path = "../exercises/22_clippy/clippy1.rs" },
-  { name = "clippy1_sol", path = "../solutions/22_clippy/clippy1.rs" },
-  { name = "clippy2", path = "../exercises/22_clippy/clippy2.rs" },
-  { name = "clippy2_sol", path = "../solutions/22_clippy/clippy2.rs" },
-  { name = "clippy3", path = "../exercises/22_clippy/clippy3.rs" },
-  { name = "clippy3_sol", path = "../solutions/22_clippy/clippy3.rs" },
-  { name = "using_as", path = "../exercises/23_conversions/using_as.rs" },
-  { name = "using_as_sol", path = "../solutions/23_conversions/using_as.rs" },
-  { name = "from_into", path = "../exercises/23_conversions/from_into.rs" },
-  { name = "from_into_sol", path = "../solutions/23_conversions/from_into.rs" },
-  { name = "from_str", path = "../exercises/23_conversions/from_str.rs" },
-  { name = "from_str_sol", path = "../solutions/23_conversions/from_str.rs" },
-  { name = "try_from_into", path = "../exercises/23_conversions/try_from_into.rs" },
-  { name = "try_from_into_sol", path = "../solutions/23_conversions/try_from_into.rs" },
-  { name = "as_ref_mut", path = "../exercises/23_conversions/as_ref_mut.rs" },
-  { name = "as_ref_mut_sol", path = "../solutions/23_conversions/as_ref_mut.rs" },
-]
-
-[package]
-name = "exercises"
-edition = "2024"
-# Don't publish the exercises on crates.io!
-publish = false
-
-[profile.release]
-panic = "abort"
-
-[profile.dev]
-panic = "abort"
-
-[lints.rust]
-# You shouldn't write unsafe code in Rustlings!
-unsafe_code = "forbid"
-# You don't need unstable features in Rustlings and shouldn't rely on them while learning Rust.
-unstable_features = "forbid"
-# Dead code warnings can't be avoided in some exercises and might distract while learning.
-dead_code = "allow"
-
-[lints.clippy]
-# You forgot a `todo!()`!
-todo = "forbid"
-# This can only happen by mistake in Rustlings.
-empty_loop = "forbid"
-# No infinite loops are needed in Rustlings.
-infinite_loop = "deny"
-# You shouldn't leak memory while still learning Rust!
-mem_forget = "deny"
-# Currently, there are no disallowed methods. This line avoids problems when developing Rustlings.
-disallowed_methods = "allow"

dev/rustlings-repo.txt

@@ -1 +0,0 @@
-This file is used to check if the user tries to run Rustlings in the repository (the method before version 6)

exercises/00_intro/intro1.rs

@@ -1,24 +0,0 @@
-// TODO: We sometimes encourage you to keep trying things on a given exercise
-// even after you already figured it out. If you got everything working and feel
-// ready for the next exercise, enter `n` in the terminal.
-//
-// The exercise file will be reloaded when you change one of the lines below!
-// Try adding a new `println!` and check the updated output in the terminal.
-
-fn main() {
-    println!(r#"       Welcome to...                      "#);
-    println!(r#"                 _   _ _                  "#);
-    println!(r#"  _ __ _   _ ___| |_| (_)_ __   __ _ ___  "#);
-    println!(r#" | '__| | | / __| __| | | '_ \ / _` / __| "#);
-    println!(r#" | |  | |_| \__ \ |_| | | | | | (_| \__ \ "#);
-    println!(r#" |_|   \__,_|___/\__|_|_|_| |_|\__, |___/ "#);
-    println!(r#"                               |___/      "#);
-    println!();
-    println!("This exercise compiles successfully. The remaining exercises contain a compiler");
-    println!("or logic error. The central concept behind Rustlings is to fix these errors and");
-    println!("solve the exercises. Good luck!");
-    println!();
-    println!("The file of this exercise is `exercises/00_intro/intro1.rs`. Have a look!");
-    println!("The current exercise path will be always shown under the progress bar.");
-    println!("You can click on the path to open the exercise file in your editor.");
-}

exercises/00_intro/intro2.rs

@@ -1,4 +0,0 @@
-fn main() {
-    // TODO: Fix the code to print "Hello world!".
-    printline!("Hello world!");
-}

exercises/01_variables/variables1.rs

@@ -1,6 +0,0 @@
-fn main() {
-    // TODO: Add the missing keyword.
-    x = 5;
-
-    println!("x has the value {x}");
-}

exercises/01_variables/variables3.rs

@@ -1,6 +0,0 @@
-fn main() {
-    // TODO: Change the line below to fix the compiler error.
-    let x: i32;
-
-    println!("Number {x}");
-}

exercises/01_variables/variables4.rs

@@ -1,8 +0,0 @@
-// TODO: Fix the compiler error.
-fn main() {
-    let x = 3;
-    println!("Number {x}");
-
-    x = 5; // Don't change this line
-    println!("Number {x}");
-}

exercises/01_variables/variables5.rs

@@ -1,8 +0,0 @@
-fn main() {
-    let number = "T-H-R-E-E"; // Don't change this line
-    println!("Spell a number: {number}");
-
-    // TODO: Fix the compiler error by changing the line below without renaming the variable.
-    number = 3;
-    println!("Number plus two is: {}", number + 2);
-}

exercises/01_variables/variables6.rs

@@ -1,6 +0,0 @@
-// TODO: Change the line below to fix the compiler error.
-const NUMBER = 3;
-
-fn main() {
-    println!("Number: {NUMBER}");
-}

exercises/02_functions/functions1.rs

@@ -1,5 +0,0 @@
-// TODO: Add some function with the name `call_me` without arguments or a return value.
-
-fn main() {
-    call_me(); // Don't change this line
-}

exercises/02_functions/functions3.rs

@@ -1,10 +0,0 @@
-fn call_me(num: u8) {
-    for i in 0..num {
-        println!("Ring! Call number {}", i + 1);
-    }
-}
-
-fn main() {
-    // TODO: Fix the function call.
-    call_me();
-}

exercises/02_functions/functions4.rs

@@ -1,22 +0,0 @@
-// This store is having a sale where if the price is an even number, you get 10
-// Rustbucks off, but if it's an odd number, it's 3 Rustbucks off.
-// Don't worry about the function bodies themselves, we are only interested in
-// the signatures for now.
-
-fn is_even(num: i64) -> bool {
-    num % 2 == 0
-}
-
-// TODO: Fix the function signature.
-fn sale_price(price: i64) -> {
-    if is_even(price) {
-        price - 10
-    } else {
-        price - 3
-    }
-}
-
-fn main() {
-    let original_price = 51;
-    println!("Your sale price is {}", sale_price(original_price));
-}

exercises/02_functions/functions5.rs

@@ -1,9 +0,0 @@
-// TODO: Fix the function body without changing the signature.
-fn square(num: i32) -> i32 {
-    num * num;
-}
-
-fn main() {
-    let answer = square(3);
-    println!("The square of 3 is {answer}");
-}

exercises/03_if/if2.rs

@@ -1,37 +0,0 @@
-// TODO: Fix the compiler error on this function.
-fn picky_eater(food: &str) -> &str {
-    if food == "strawberry" {
-        "Yummy!"
-    } else {
-        1
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-// TODO: Read the tests to understand the desired behavior.
-// Make all tests pass without changing them.
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn yummy_food() {
-        // This means that calling `picky_eater` with the argument "strawberry" should return "Yummy!".
-        assert_eq!(picky_eater("strawberry"), "Yummy!");
-    }
-
-    #[test]
-    fn neutral_food() {
-        assert_eq!(picky_eater("potato"), "I guess I can eat that.");
-    }
-
-    #[test]
-    fn default_disliked_food() {
-        assert_eq!(picky_eater("broccoli"), "No thanks!");
-        assert_eq!(picky_eater("gummy bears"), "No thanks!");
-        assert_eq!(picky_eater("literally anything"), "No thanks!");
-    }
-}

exercises/03_if/if3.rs

@@ -1,53 +0,0 @@
-fn animal_habitat(animal: &str) -> &str {
-    // TODO: Fix the compiler error in the statement below.
-    let identifier = if animal == "crab" {
-        1
-    } else if animal == "gopher" {
-        2.0
-    } else if animal == "snake" {
-        3
-    } else {
-        "Unknown"
-    };
-
-    // Don't change the expression below!
-    if identifier == 1 {
-        "Beach"
-    } else if identifier == 2 {
-        "Burrow"
-    } else if identifier == 3 {
-        "Desert"
-    } else {
-        "Unknown"
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-// Don't change the tests!
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn gopher_lives_in_burrow() {
-        assert_eq!(animal_habitat("gopher"), "Burrow")
-    }
-
-    #[test]
-    fn snake_lives_in_desert() {
-        assert_eq!(animal_habitat("snake"), "Desert")
-    }
-
-    #[test]
-    fn crab_lives_on_beach() {
-        assert_eq!(animal_habitat("crab"), "Beach")
-    }
-
-    #[test]
-    fn unknown_animal() {
-        assert_eq!(animal_habitat("dinosaur"), "Unknown")
-    }
-}

exercises/04_primitive_types/primitive_types1.rs

@@ -1,15 +0,0 @@
-// Booleans (`bool`)
-
-fn main() {
-    let is_morning = true;
-    if is_morning {
-        println!("Good morning!");
-    }
-
-    // TODO: Define a boolean variable with the name `is_evening` before the `if` statement below.
-    // The value of the variable should be the negation (opposite) of `is_morning`.
-    // let …
-    if is_evening {
-        println!("Good evening!");
-    }
-}

exercises/04_primitive_types/primitive_types3.rs

@@ -1,11 +0,0 @@
-fn main() {
-    // TODO: Create an array called `a` with at least 100 elements in it.
-    // let a = ???
-
-    if a.len() >= 100 {
-        println!("Wow, that's a big array!");
-    } else {
-        println!("Meh, I eat arrays like that for breakfast.");
-        panic!("Array not big enough, more elements needed");
-    }
-}

exercises/04_primitive_types/primitive_types4.rs

@@ -1,16 +0,0 @@
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn slice_out_of_array() {
-        let a = [1, 2, 3, 4, 5];
-
-        // TODO: Get a slice called `nice_slice` out of the array `a` so that the test passes.
-        // let nice_slice = ???
-
-        assert_eq!([2, 3, 4], nice_slice);
-    }
-}

exercises/04_primitive_types/primitive_types5.rs

@@ -1,8 +0,0 @@
-fn main() {
-    let cat = ("Furry McFurson", 3.5);
-
-    // TODO: Destructure the `cat` tuple in one statement so that the println works.
-    // let /* your pattern here */ = cat;
-
-    println!("{name} is {age} years old");
-}

exercises/04_primitive_types/primitive_types6.rs

@@ -1,17 +0,0 @@
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn indexing_tuple() {
-        let numbers = (1, 2, 3);
-
-        // TODO: Use a tuple index to access the second element of `numbers`
-        // and assign it to a variable called `second`.
-        // let second = ???;
-
-        assert_eq!(second, 2, "This is not the 2nd number in the tuple!");
-    }
-}

exercises/05_vecs/vecs1.rs

@@ -1,24 +0,0 @@
-fn array_and_vec() -> ([i32; 4], Vec<i32>) {
-    let a = [10, 20, 30, 40]; // Array
-
-    // TODO: Create a vector called `v` which contains the exact same elements as in the array `a`.
-    // Use the vector macro.
-    // let v = ???;
-
-    (a, v)
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_array_and_vec_similarity() {
-        let (a, v) = array_and_vec();
-        assert_eq!(a, *v);
-    }
-}

exercises/05_vecs/vecs2.rs

@@ -1,60 +0,0 @@
-fn vec_loop(input: &[i32]) -> Vec<i32> {
-    let mut output = Vec::new();
-
-    for element in input {
-        // TODO: Multiply each element in the `input` slice by 2 and push it to
-        // the `output` vector.
-    }
-
-    output
-}
-
-fn vec_map_example(input: &[i32]) -> Vec<i32> {
-    // An example of collecting a vector after mapping.
-    // We map each element of the `input` slice to its value plus 1.
-    // If the input is `[1, 2, 3]`, the output is `[2, 3, 4]`.
-    input.iter().map(|element| element + 1).collect()
-}
-
-fn vec_map(input: &[i32]) -> Vec<i32> {
-    // TODO: Here, we also want to multiply each element in the `input` slice
-    // by 2, but with iterator mapping instead of manually pushing into an empty
-    // vector.
-    // See the example in the function `vec_map_example` above.
-    input
-        .iter()
-        .map(|element| {
-            // ???
-        })
-        .collect()
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_vec_loop() {
-        let input = [2, 4, 6, 8, 10];
-        let ans = vec_loop(&input);
-        assert_eq!(ans, [4, 8, 12, 16, 20]);
-    }
-
-    #[test]
-    fn test_vec_map_example() {
-        let input = [1, 2, 3];
-        let ans = vec_map_example(&input);
-        assert_eq!(ans, [2, 3, 4]);
-    }
-
-    #[test]
-    fn test_vec_map() {
-        let input = [2, 4, 6, 8, 10];
-        let ans = vec_map(&input);
-        assert_eq!(ans, [4, 8, 12, 16, 20]);
-    }
-}

exercises/06_move_semantics/move_semantics1.rs

@@ -1,24 +0,0 @@
-// TODO: Fix the compiler error in this function.
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
-    let vec = vec;
-
-    vec.push(88);
-
-    vec
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn move_semantics1() {
-        let vec0 = vec![22, 44, 66];
-        let vec1 = fill_vec(vec0);
-        assert_eq!(vec1, vec![22, 44, 66, 88]);
-    }
-}

exercises/06_move_semantics/move_semantics2.rs

@@ -1,28 +0,0 @@
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
-    let mut vec = vec;
-
-    vec.push(88);
-
-    vec
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    // TODO: Make both vectors `vec0` and `vec1` accessible at the same time to
-    // fix the compiler error in the test.
-    #[test]
-    fn move_semantics2() {
-        let vec0 = vec![22, 44, 66];
-
-        let vec1 = fill_vec(vec0);
-
-        assert_eq!(vec0, [22, 44, 66]);
-        assert_eq!(vec1, [22, 44, 66, 88]);
-    }
-}

exercises/06_move_semantics/move_semantics3.rs

@@ -1,22 +0,0 @@
-// TODO: Fix the compiler error in the function without adding any new line.
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
-    vec.push(88);
-
-    vec
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn move_semantics3() {
-        let vec0 = vec![22, 44, 66];
-        let vec1 = fill_vec(vec0);
-        assert_eq!(vec1, [22, 44, 66, 88]);
-    }
-}

exercises/06_move_semantics/move_semantics4.rs

@@ -1,18 +0,0 @@
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    // TODO: Fix the compiler errors only by reordering the lines in the test.
-    // Don't add, change or remove any line.
-    #[test]
-    fn move_semantics4() {
-        let mut x = Vec::new();
-        let y = &mut x;
-        let z = &mut x;
-        y.push(42);
-        z.push(13);
-        assert_eq!(x, [42, 13]);
-    }
-}

exercises/06_move_semantics/move_semantics5.rs

@@ -1,24 +0,0 @@
-#![allow(clippy::ptr_arg)]
-
-// TODO: Fix the compiler errors without changing anything except adding or
-// removing references (the character `&`).
-
-// Shouldn't take ownership
-fn get_char(data: String) -> char {
-    data.chars().last().unwrap()
-}
-
-// Should take ownership
-fn string_uppercase(mut data: &String) {
-    data = data.to_uppercase();
-
-    println!("{data}");
-}
-
-fn main() {
-    let data = "Rust is great!".to_string();
-
-    get_char(data);
-
-    string_uppercase(&data);
-}

exercises/07_structs/structs1.rs

@@ -1,47 +0,0 @@
-struct ColorRegularStruct {
-    // TODO: Add the fields that the test `regular_structs` expects.
-    // What types should the fields have? What are the minimum and maximum values for RGB colors?
-}
-
-struct ColorTupleStruct(/* TODO: Add the fields that the test `tuple_structs` expects */);
-
-#[derive(Debug)]
-struct UnitStruct;
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn regular_structs() {
-        // TODO: Instantiate a regular struct.
-        // let green =
-
-        assert_eq!(green.red, 0);
-        assert_eq!(green.green, 255);
-        assert_eq!(green.blue, 0);
-    }
-
-    #[test]
-    fn tuple_structs() {
-        // TODO: Instantiate a tuple struct.
-        // let green =
-
-        assert_eq!(green.0, 0);
-        assert_eq!(green.1, 255);
-        assert_eq!(green.2, 0);
-    }
-
-    #[test]
-    fn unit_structs() {
-        // TODO: Instantiate a unit struct.
-        // let unit_struct =
-        let message = format!("{unit_struct:?}s are fun!");
-
-        assert_eq!(message, "UnitStructs are fun!");
-    }
-}

exercises/07_structs/structs3.rs

@@ -1,87 +0,0 @@
-// Structs contain data, but can also have logic. In this exercise, we have
-// defined the `Package` struct, and we want to test some logic attached to it.
-
-#[derive(Debug)]
-struct Package {
-    sender_country: String,
-    recipient_country: String,
-    weight_in_grams: u32,
-}
-
-impl Package {
-    fn new(sender_country: String, recipient_country: String, weight_in_grams: u32) -> Self {
-        if weight_in_grams < 10 {
-            // This isn't how you should handle errors in Rust, but we will
-            // learn about error handling later.
-            panic!("Can't ship a package with weight below 10 grams");
-        }
-
-        Self {
-            sender_country,
-            recipient_country,
-            weight_in_grams,
-        }
-    }
-
-    // TODO: Add the correct return type to the function signature.
-    fn is_international(&self) {
-        // TODO: Read the tests that use this method to find out when a package
-        // is considered international.
-    }
-
-    // TODO: Add the correct return type to the function signature.
-    fn get_fees(&self, cents_per_gram: u32) {
-        // TODO: Calculate the package's fees.
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    #[should_panic]
-    fn fail_creating_weightless_package() {
-        let sender_country = String::from("Spain");
-        let recipient_country = String::from("Austria");
-
-        Package::new(sender_country, recipient_country, 5);
-    }
-
-    #[test]
-    fn create_international_package() {
-        let sender_country = String::from("Spain");
-        let recipient_country = String::from("Russia");
-
-        let package = Package::new(sender_country, recipient_country, 1200);
-
-        assert!(package.is_international());
-    }
-
-    #[test]
-    fn create_local_package() {
-        let sender_country = String::from("Canada");
-        let recipient_country = sender_country.clone();
-
-        let package = Package::new(sender_country, recipient_country, 1200);
-
-        assert!(!package.is_international());
-    }
-
-    #[test]
-    fn calculate_transport_fees() {
-        let sender_country = String::from("Spain");
-        let recipient_country = String::from("Spain");
-
-        let cents_per_gram = 3;
-
-        let package = Package::new(sender_country, recipient_country, 1500);
-
-        assert_eq!(package.get_fees(cents_per_gram), 4500);
-        assert_eq!(package.get_fees(cents_per_gram * 2), 9000);
-    }
-}

exercises/08_enums/enums3.rs

@@ -1,88 +0,0 @@
-struct Point {
-    x: u64,
-    y: u64,
-}
-
-enum Message {
-    Resize { width: u64, height: u64 },
-    Move(Point),
-    Echo(String),
-    ChangeColor(u8, u8, u8),
-    Quit,
-}
-
-struct State {
-    width: u64,
-    height: u64,
-    position: Point,
-    message: String,
-    // RGB color composed of red, green and blue.
-    color: (u8, u8, u8),
-    quit: bool,
-}
-
-impl State {
-    fn resize(&mut self, width: u64, height: u64) {
-        self.width = width;
-        self.height = height;
-    }
-
-    fn move_position(&mut self, point: Point) {
-        self.position = point;
-    }
-
-    fn echo(&mut self, s: String) {
-        self.message = s;
-    }
-
-    fn change_color(&mut self, red: u8, green: u8, blue: u8) {
-        self.color = (red, green, blue);
-    }
-
-    fn quit(&mut self) {
-        self.quit = true;
-    }
-
-    fn process(&mut self, message: Message) {
-        // TODO: Create a match expression to process the different message
-        // variants using the methods defined above.
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_match_message_call() {
-        let mut state = State {
-            width: 0,
-            height: 0,
-            position: Point { x: 0, y: 0 },
-            message: String::from("hello world"),
-            color: (0, 0, 0),
-            quit: false,
-        };
-
-        state.process(Message::Resize {
-            width: 10,
-            height: 30,
-        });
-        state.process(Message::Move(Point { x: 10, y: 15 }));
-        state.process(Message::Echo(String::from("Hello world!")));
-        state.process(Message::ChangeColor(255, 0, 255));
-        state.process(Message::Quit);
-
-        assert_eq!(state.width, 10);
-        assert_eq!(state.height, 30);
-        assert_eq!(state.position.x, 10);
-        assert_eq!(state.position.y, 15);
-        assert_eq!(state.message, "Hello world!");
-        assert_eq!(state.color, (255, 0, 255));
-        assert!(state.quit);
-    }
-}

exercises/09_strings/strings1.rs

@@ -1,9 +0,0 @@
-// TODO: Fix the compiler error without changing the function signature.
-fn current_favorite_color() -> String {
-    "blue"
-}
-
-fn main() {
-    let answer = current_favorite_color();
-    println!("My current favorite color is {answer}");
-}

exercises/09_strings/strings3.rs

@@ -1,46 +0,0 @@
-fn trim_me(input: &str) -> &str {
-    // TODO: Remove whitespace from both ends of a string.
-}
-
-fn compose_me(input: &str) -> String {
-    // TODO: Add " world!" to the string! There are multiple ways to do this.
-}
-
-fn replace_me(input: &str) -> String {
-    // TODO: Replace "cars" in the string with "balloons".
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn trim_a_string() {
-        assert_eq!(trim_me("Hello!     "), "Hello!");
-        assert_eq!(trim_me("  What's up!"), "What's up!");
-        assert_eq!(trim_me("   Hola!  "), "Hola!");
-        assert_eq!(trim_me("Hi!"), "Hi!");
-    }
-
-    #[test]
-    fn compose_a_string() {
-        assert_eq!(compose_me("Hello"), "Hello world!");
-        assert_eq!(compose_me("Goodbye"), "Goodbye world!");
-    }
-
-    #[test]
-    fn replace_a_string() {
-        assert_eq!(
-            replace_me("I think cars are cool"),
-            "I think balloons are cool",
-        );
-        assert_eq!(
-            replace_me("I love to look at cars"),
-            "I love to look at balloons",
-        );
-    }
-}

exercises/09_strings/strings4.rs

@@ -1,37 +0,0 @@
-// Calls of this function should be replaced with calls of `string_slice` or `string`.
-fn placeholder() {}
-
-fn string_slice(arg: &str) {
-    println!("{arg}");
-}
-
-fn string(arg: String) {
-    println!("{arg}");
-}
-
-// TODO: Here are a bunch of values - some are `String`, some are `&str`.
-// Your task is to replace `placeholder(…)` with either `string_slice(…)`
-// or `string(…)` depending on what you think each value is.
-fn main() {
-    placeholder("blue");
-
-    placeholder("red".to_string());
-
-    placeholder(String::from("hi"));
-
-    placeholder("rust is fun!".to_owned());
-
-    placeholder("nice weather".into());
-
-    placeholder(format!("Interpolation {}", "Station"));
-
-    // WARNING: This is byte indexing, not character indexing.
-    // Character indexing can be done using `s.chars().nth(INDEX)`.
-    placeholder(&String::from("abc")[0..1]);
-
-    placeholder("  hello there ".trim());
-
-    placeholder("Happy Monday!".replace("Mon", "Tues"));
-
-    placeholder("mY sHiFt KeY iS sTiCkY".to_lowercase());
-}

exercises/10_modules/modules2.rs

@@ -1,26 +0,0 @@
-// You can bring module paths into scopes and provide new names for them with
-// the `use` and `as` keywords.
-
-mod delicious_snacks {
-    // TODO: Add the following two `use` statements after fixing them.
-    // use self::fruits::PEAR as ???;
-    // use self::veggies::CUCUMBER as ???;
-
-    mod fruits {
-        pub const PEAR: &str = "Pear";
-        pub const APPLE: &str = "Apple";
-    }
-
-    mod veggies {
-        pub const CUCUMBER: &str = "Cucumber";
-        pub const CARROT: &str = "Carrot";
-    }
-}
-
-fn main() {
-    println!(
-        "favorite snacks: {} and {}",
-        delicious_snacks::fruit,
-        delicious_snacks::veggie,
-    );
-}

exercises/10_modules/modules3.rs

@@ -1,13 +0,0 @@
-// You can use the `use` keyword to bring module paths from modules from
-// anywhere and especially from the standard library into your scope.
-
-// TODO: Bring `SystemTime` and `UNIX_EPOCH` from the `std::time` module into
-// your scope. Bonus style points if you can do it with one line!
-// use ???;
-
-fn main() {
-    match SystemTime::now().duration_since(UNIX_EPOCH) {
-        Ok(n) => println!("1970-01-01 00:00:00 UTC was {} seconds ago!", n.as_secs()),
-        Err(_) => panic!("SystemTime before UNIX EPOCH!"),
-    }
-}

exercises/11_hashmaps/hashmaps2.rs

@@ -1,97 +0,0 @@
-// We're collecting different fruits to bake a delicious fruit cake. For this,
-// we have a basket, which we'll represent in the form of a hash map. The key
-// represents the name of each fruit we collect and the value represents how
-// many of that particular fruit we have collected. Three types of fruits -
-// Apple (4), Mango (2) and Lychee (5) are already in the basket hash map. You
-// must add fruit to the basket so that there is at least one of each kind and
-// more than 11 in total - we have a lot of mouths to feed. You are not allowed
-// to insert any more of the fruits that are already in the basket (Apple,
-// Mango, and Lychee).
-
-use std::collections::HashMap;
-
-#[derive(Hash, PartialEq, Eq, Debug)]
-enum Fruit {
-    Apple,
-    Banana,
-    Mango,
-    Lychee,
-    Pineapple,
-}
-
-fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
-    let fruit_kinds = [
-        Fruit::Apple,
-        Fruit::Banana,
-        Fruit::Mango,
-        Fruit::Lychee,
-        Fruit::Pineapple,
-    ];
-
-    for fruit in fruit_kinds {
-        // TODO: Insert new fruits if they are not already present in the
-        // basket. Note that you are not allowed to put any type of fruit that's
-        // already present!
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    // Don't modify this function!
-    fn get_fruit_basket() -> HashMap<Fruit, u32> {
-        let content = [(Fruit::Apple, 4), (Fruit::Mango, 2), (Fruit::Lychee, 5)];
-        HashMap::from_iter(content)
-    }
-
-    #[test]
-    fn test_given_fruits_are_not_modified() {
-        let mut basket = get_fruit_basket();
-        fruit_basket(&mut basket);
-        assert_eq!(*basket.get(&Fruit::Apple).unwrap(), 4);
-        assert_eq!(*basket.get(&Fruit::Mango).unwrap(), 2);
-        assert_eq!(*basket.get(&Fruit::Lychee).unwrap(), 5);
-    }
-
-    #[test]
-    fn at_least_five_types_of_fruits() {
-        let mut basket = get_fruit_basket();
-        fruit_basket(&mut basket);
-        let count_fruit_kinds = basket.len();
-        assert!(count_fruit_kinds >= 5);
-    }
-
-    #[test]
-    fn greater_than_eleven_fruits() {
-        let mut basket = get_fruit_basket();
-        fruit_basket(&mut basket);
-        let count = basket.values().sum::<u32>();
-        assert!(count > 11);
-    }
-
-    #[test]
-    fn all_fruit_types_in_basket() {
-        let fruit_kinds = [
-            Fruit::Apple,
-            Fruit::Banana,
-            Fruit::Mango,
-            Fruit::Lychee,
-            Fruit::Pineapple,
-        ];
-
-        let mut basket = get_fruit_basket();
-        fruit_basket(&mut basket);
-
-        for fruit_kind in fruit_kinds {
-            let Some(amount) = basket.get(&fruit_kind) else {
-                panic!("Fruit kind {fruit_kind:?} was not found in basket");
-            };
-            assert!(*amount > 0);
-        }
-    }
-}

exercises/11_hashmaps/hashmaps3.rs

@@ -1,77 +0,0 @@
-// A list of scores (one per line) of a soccer match is given. Each line is of
-// the form "<team_1_name>,<team_2_name>,<team_1_goals>,<team_2_goals>"
-// Example: "England,France,4,2" (England scored 4 goals, France 2).
-//
-// You have to build a scores table containing the name of the team, the total
-// number of goals the team scored, and the total number of goals the team
-// conceded.
-
-use std::collections::HashMap;
-
-// A structure to store the goal details of a team.
-#[derive(Default)]
-struct TeamScores {
-    goals_scored: u8,
-    goals_conceded: u8,
-}
-
-fn build_scores_table(results: &str) -> HashMap<&str, TeamScores> {
-    // The name of the team is the key and its associated struct is the value.
-    let mut scores = HashMap::<&str, TeamScores>::new();
-
-    for line in results.lines() {
-        let mut split_iterator = line.split(',');
-        // NOTE: We use `unwrap` because we didn't deal with error handling yet.
-        let team_1_name = split_iterator.next().unwrap();
-        let team_2_name = split_iterator.next().unwrap();
-        let team_1_score: u8 = split_iterator.next().unwrap().parse().unwrap();
-        let team_2_score: u8 = split_iterator.next().unwrap().parse().unwrap();
-
-        // TODO: Populate the scores table with the extracted details.
-        // Keep in mind that goals scored by team 1 will be the number of goals
-        // conceded by team 2. Similarly, goals scored by team 2 will be the
-        // number of goals conceded by team 1.
-    }
-
-    scores
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    const RESULTS: &str = "England,France,4,2
-France,Italy,3,1
-Poland,Spain,2,0
-Germany,England,2,1
-England,Spain,1,0";
-
-    #[test]
-    fn build_scores() {
-        let scores = build_scores_table(RESULTS);
-
-        assert!(["England", "France", "Germany", "Italy", "Poland", "Spain"]
-            .into_iter()
-            .all(|team_name| scores.contains_key(team_name)));
-    }
-
-    #[test]
-    fn validate_team_score_1() {
-        let scores = build_scores_table(RESULTS);
-        let team = scores.get("England").unwrap();
-        assert_eq!(team.goals_scored, 6);
-        assert_eq!(team.goals_conceded, 4);
-    }
-
-    #[test]
-    fn validate_team_score_2() {
-        let scores = build_scores_table(RESULTS);
-        let team = scores.get("Spain").unwrap();
-        assert_eq!(team.goals_scored, 0);
-        assert_eq!(team.goals_conceded, 3);
-    }
-}

exercises/12_options/options1.rs

@@ -1,36 +0,0 @@
-// This function returns how much ice cream there is left in the fridge.
-// If it's before 22:00 (24-hour system), then 5 scoops are left. At 22:00,
-// someone eats it all, so no ice cream is left (value 0). Return `None` if
-// `hour_of_day` is higher than 23.
-fn maybe_ice_cream(hour_of_day: u16) -> Option<u16> {
-    // TODO: Complete the function body.
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn raw_value() {
-        // TODO: Fix this test. How do you get the value contained in the
-        // Option?
-        let ice_creams = maybe_ice_cream(12);
-
-        assert_eq!(ice_creams, 5); // Don't change this line.
-    }
-
-    #[test]
-    fn check_ice_cream() {
-        assert_eq!(maybe_ice_cream(0), Some(5));
-        assert_eq!(maybe_ice_cream(9), Some(5));
-        assert_eq!(maybe_ice_cream(18), Some(5));
-        assert_eq!(maybe_ice_cream(22), Some(0));
-        assert_eq!(maybe_ice_cream(23), Some(0));
-        assert_eq!(maybe_ice_cream(24), None);
-        assert_eq!(maybe_ice_cream(25), None);
-    }
-}

exercises/12_options/options2.rs

@@ -1,39 +0,0 @@
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn simple_option() {
-        let target = "rustlings";
-        let optional_target = Some(target);
-
-        // TODO: Make this an if-let statement whose value is `Some`.
-        word = optional_target {
-            assert_eq!(word, target);
-        }
-    }
-
-    #[test]
-    fn layered_option() {
-        let range = 10;
-        let mut optional_integers: Vec<Option<i8>> = vec![None];
-
-        for i in 1..=range {
-            optional_integers.push(Some(i));
-        }
-
-        let mut cursor = range;
-
-        // TODO: Make this a while-let statement. Remember that `Vec::pop()`
-        // adds another layer of `Option`. You can do nested pattern matching
-        // in if-let and while-let statements.
-        integer = optional_integers.pop() {
-            assert_eq!(integer, cursor);
-            cursor -= 1;
-        }
-
-        assert_eq!(cursor, 0);
-    }
-}

exercises/12_options/options3.rs

@@ -1,17 +0,0 @@
-#[derive(Debug)]
-struct Point {
-    x: i32,
-    y: i32,
-}
-
-fn main() {
-    let optional_point = Some(Point { x: 100, y: 200 });
-
-    // TODO: Fix the compiler error by adding something to this match statement.
-    match optional_point {
-        Some(p) => println!("Coordinates are {},{}", p.x, p.y),
-        _ => panic!("No match!"),
-    }
-
-    println!("{optional_point:?}"); // Don't change this line.
-}

exercises/13_error_handling/errors1.rs

@@ -1,41 +0,0 @@
-// TODO: This function refuses to generate text to be printed on a nametag if
-// you pass it an empty string. It'd be nicer if it explained what the problem
-// was instead of just returning `None`. Thankfully, Rust has a similar
-// construct to `Option` that can be used to express error conditions. Change
-// the function signature and body to return `Result<String, String>` instead
-// of `Option<String>`.
-fn generate_nametag_text(name: String) -> Option<String> {
-    if name.is_empty() {
-        // Empty names aren't allowed
-        None
-    } else {
-        Some(format!("Hi! My name is {name}"))
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn generates_nametag_text_for_a_nonempty_name() {
-        assert_eq!(
-            generate_nametag_text("Beyoncé".to_string()).as_deref(),
-            Ok("Hi! My name is Beyoncé"),
-        );
-    }
-
-    #[test]
-    fn explains_why_generating_nametag_text_fails() {
-        assert_eq!(
-            generate_nametag_text(String::new())
-                .as_ref()
-                .map_err(|e| e.as_str()),
-            Err("Empty names aren't allowed"),
-        );
-    }
-}

exercises/13_error_handling/errors4.rs

@@ -1,37 +0,0 @@
-#[derive(PartialEq, Debug)]
-enum CreationError {
-    Negative,
-    Zero,
-}
-
-#[derive(PartialEq, Debug)]
-struct PositiveNonzeroInteger(u64);
-
-impl PositiveNonzeroInteger {
-    fn new(value: i64) -> Result<Self, CreationError> {
-        // TODO: This function shouldn't always return an `Ok`.
-        Ok(Self(value as u64))
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_creation() {
-        assert_eq!(
-            PositiveNonzeroInteger::new(10),
-            Ok(PositiveNonzeroInteger(10)),
-        );
-        assert_eq!(
-            PositiveNonzeroInteger::new(-10),
-            Err(CreationError::Negative),
-        );
-        assert_eq!(PositiveNonzeroInteger::new(0), Err(CreationError::Zero));
-    }
-}

exercises/13_error_handling/errors5.rs

@@ -1,56 +0,0 @@
-// This exercise is an altered version of the `errors4` exercise. It uses some
-// concepts that we won't get to until later in the course, like `Box` and the
-// `From` trait. It's not important to understand them in detail right now, but
-// you can read ahead if you like. For now, think of the `Box<dyn ???>` type as
-// an "I want anything that does ???" type.
-//
-// In short, this particular use case for boxes is for when you want to own a
-// value and you care only that it is a type which implements a particular
-// trait. To do so, the `Box` is declared as of type `Box<dyn Trait>` where
-// `Trait` is the trait the compiler looks for on any value used in that
-// context. For this exercise, that context is the potential errors which
-// can be returned in a `Result`.
-
-use std::error::Error;
-use std::fmt;
-
-#[derive(PartialEq, Debug)]
-enum CreationError {
-    Negative,
-    Zero,
-}
-
-// This is required so that `CreationError` can implement `Error`.
-impl fmt::Display for CreationError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let description = match *self {
-            CreationError::Negative => "number is negative",
-            CreationError::Zero => "number is zero",
-        };
-        f.write_str(description)
-    }
-}
-
-impl Error for CreationError {}
-
-#[derive(PartialEq, Debug)]
-struct PositiveNonzeroInteger(u64);
-
-impl PositiveNonzeroInteger {
-    fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
-        match value {
-            x if x < 0 => Err(CreationError::Negative),
-            0 => Err(CreationError::Zero),
-            x => Ok(PositiveNonzeroInteger(x as u64)),
-        }
-    }
-}
-
-// TODO: Add the correct return type `Result<(), Box<dyn ???>>`. What can we
-// use to describe both errors? Is there a trait which both errors implement?
-fn main() {
-    let pretend_user_input = "42";
-    let x: i64 = pretend_user_input.parse()?;
-    println!("output={:?}", PositiveNonzeroInteger::new(x)?);
-    Ok(())
-}

exercises/13_error_handling/errors6.rs

@@ -1,89 +0,0 @@
-// Using catch-all error types like `Box<dyn Error>` isn't recommended for
-// library code where callers might want to make decisions based on the error
-// content instead of printing it out or propagating it further. Here, we define
-// a custom error type to make it possible for callers to decide what to do next
-// when our function returns an error.
-
-use std::num::ParseIntError;
-
-#[derive(PartialEq, Debug)]
-enum CreationError {
-    Negative,
-    Zero,
-}
-
-// A custom error type that we will be using in `PositiveNonzeroInteger::parse`.
-#[derive(PartialEq, Debug)]
-enum ParsePosNonzeroError {
-    Creation(CreationError),
-    ParseInt(ParseIntError),
-}
-
-impl ParsePosNonzeroError {
-    fn from_creation(err: CreationError) -> Self {
-        Self::Creation(err)
-    }
-
-    // TODO: Add another error conversion function here.
-    // fn from_parse_int(???) -> Self { ??? }
-}
-
-#[derive(PartialEq, Debug)]
-struct PositiveNonzeroInteger(u64);
-
-impl PositiveNonzeroInteger {
-    fn new(value: i64) -> Result<Self, CreationError> {
-        match value {
-            x if x < 0 => Err(CreationError::Negative),
-            0 => Err(CreationError::Zero),
-            x => Ok(Self(x as u64)),
-        }
-    }
-
-    fn parse(s: &str) -> Result<Self, ParsePosNonzeroError> {
-        // TODO: change this to return an appropriate error instead of panicking
-        // when `parse()` returns an error.
-        let x: i64 = s.parse().unwrap();
-        Self::new(x).map_err(ParsePosNonzeroError::from_creation)
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod test {
-    use super::*;
-
-    #[test]
-    fn test_parse_error() {
-        assert!(matches!(
-            PositiveNonzeroInteger::parse("not a number"),
-            Err(ParsePosNonzeroError::ParseInt(_)),
-        ));
-    }
-
-    #[test]
-    fn test_negative() {
-        assert_eq!(
-            PositiveNonzeroInteger::parse("-555"),
-            Err(ParsePosNonzeroError::Creation(CreationError::Negative)),
-        );
-    }
-
-    #[test]
-    fn test_zero() {
-        assert_eq!(
-            PositiveNonzeroInteger::parse("0"),
-            Err(ParsePosNonzeroError::Creation(CreationError::Zero)),
-        );
-    }
-
-    #[test]
-    fn test_positive() {
-        let x = PositiveNonzeroInteger::new(42).unwrap();
-        assert_eq!(x.0, 42);
-        assert_eq!(PositiveNonzeroInteger::parse("42"), Ok(x));
-    }
-}

exercises/14_generics/generics1.rs

@@ -1,18 +0,0 @@
-// `Vec<T>` is generic over the type `T`. In most cases, the compiler is able to
-// infer `T`, for example after pushing a value with a concrete type to the vector.
-// But in this exercise, the compiler needs some help through a type annotation.
-
-fn main() {
-    // TODO: Fix the compiler error by annotating the type of the vector
-    // `Vec<T>`. Choose `T` as some integer type that can be created from
-    // `u8` and `i8`.
-    let mut numbers = Vec::new();
-
-    // Don't change the lines below.
-    let n1: u8 = 42;
-    numbers.push(n1.into());
-    let n2: i8 = -1;
-    numbers.push(n2.into());
-
-    println!("{numbers:?}");
-}

exercises/15_traits/traits1.rs

@@ -1,30 +0,0 @@
-// The trait `AppendBar` has only one function which appends "Bar" to any object
-// implementing this trait.
-trait AppendBar {
-    fn append_bar(self) -> Self;
-}
-
-impl AppendBar for String {
-    // TODO: Implement `AppendBar` for the type `String`.
-}
-
-fn main() {
-    let s = String::from("Foo");
-    let s = s.append_bar();
-    println!("s: {s}");
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn is_foo_bar() {
-        assert_eq!(String::from("Foo").append_bar(), "FooBar");
-    }
-
-    #[test]
-    fn is_bar_bar() {
-        assert_eq!(String::from("").append_bar().append_bar(), "BarBar");
-    }
-}

exercises/15_traits/traits2.rs

@@ -1,22 +0,0 @@
-trait AppendBar {
-    fn append_bar(self) -> Self;
-}
-
-// TODO: Implement the trait `AppendBar` for a vector of strings.
-// `append_bar` should push the string "Bar" into the vector.
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn is_vec_pop_eq_bar() {
-        let mut foo = vec![String::from("Foo")].append_bar();
-        assert_eq!(foo.pop().unwrap(), "Bar");
-        assert_eq!(foo.pop().unwrap(), "Foo");
-    }
-}

exercises/15_traits/traits4.rs

@@ -1,35 +0,0 @@
-trait Licensed {
-    fn licensing_info(&self) -> String {
-        "Default license".to_string()
-    }
-}
-
-struct SomeSoftware;
-struct OtherSoftware;
-
-impl Licensed for SomeSoftware {}
-impl Licensed for OtherSoftware {}
-
-// TODO: Fix the compiler error by only changing the signature of this function.
-fn compare_license_types(software1: ???, software2: ???) -> bool {
-    software1.licensing_info() == software2.licensing_info()
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn compare_license_information() {
-        assert!(compare_license_types(SomeSoftware, OtherSoftware));
-    }
-
-    #[test]
-    fn compare_license_information_backwards() {
-        assert!(compare_license_types(OtherSoftware, SomeSoftware));
-    }
-}

exercises/15_traits/traits5.rs

@@ -1,39 +0,0 @@
-trait SomeTrait {
-    fn some_function(&self) -> bool {
-        true
-    }
-}
-
-trait OtherTrait {
-    fn other_function(&self) -> bool {
-        true
-    }
-}
-
-struct SomeStruct;
-impl SomeTrait for SomeStruct {}
-impl OtherTrait for SomeStruct {}
-
-struct OtherStruct;
-impl SomeTrait for OtherStruct {}
-impl OtherTrait for OtherStruct {}
-
-// TODO: Fix the compiler error by only changing the signature of this function.
-fn some_func(item: ???) -> bool {
-    item.some_function() && item.other_function()
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_some_func() {
-        assert!(some_func(SomeStruct));
-        assert!(some_func(OtherStruct));
-    }
-}

exercises/16_lifetimes/lifetimes1.rs

@@ -1,28 +0,0 @@
-// The Rust compiler needs to know how to check whether supplied references are
-// valid, so that it can let the programmer know if a reference is at risk of
-// going out of scope before it is used. Remember, references are borrows and do
-// not own their own data. What if their owner goes out of scope?
-
-// TODO: Fix the compiler error by updating the function signature.
-fn longest(x: &str, y: &str) -> &str {
-    if x.len() > y.len() {
-        x
-    } else {
-        y
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_longest() {
-        assert_eq!(longest("abcd", "123"), "abcd");
-        assert_eq!(longest("abc", "1234"), "1234");
-    }
-}

exercises/16_lifetimes/lifetimes2.rs

@@ -1,20 +0,0 @@
-// Don't change this function.
-fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
-    if x.len() > y.len() {
-        x
-    } else {
-        y
-    }
-}
-
-fn main() {
-    // TODO: Fix the compiler error by moving one line.
-
-    let string1 = String::from("long string is long");
-    let result;
-    {
-        let string2 = String::from("xyz");
-        result = longest(&string1, &string2);
-    }
-    println!("The longest string is '{result}'");
-}

exercises/16_lifetimes/lifetimes3.rs

@@ -1,16 +0,0 @@
-// Lifetimes are also needed when structs hold references.
-
-// TODO: Fix the compiler errors about the struct.
-struct Book {
-    author: &str,
-    title: &str,
-}
-
-fn main() {
-    let book = Book {
-        author: "George Orwell",
-        title: "1984",
-    };
-
-    println!("{} by {}", book.title, book.author);
-}

exercises/17_tests/tests1.rs

@@ -1,23 +0,0 @@
-// Tests are important to ensure that your code does what you think it should
-// do.
-
-fn is_even(n: i64) -> bool {
-    n % 2 == 0
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    // TODO: Import `is_even`. You can use a wildcard to import everything in
-    // the outer module.
-
-    #[test]
-    fn you_can_assert() {
-        // TODO: Test the function `is_even` with some values.
-        assert!();
-        assert!();
-    }
-}

exercises/17_tests/tests2.rs

@@ -1,23 +0,0 @@
-// Calculates the power of 2 using a bit shift.
-// `1 << n` is equivalent to "2 to the power of n".
-fn power_of_2(n: u8) -> u64 {
-    1 << n
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn you_can_assert_eq() {
-        // TODO: Test the function `power_of_2` with some values.
-        assert_eq!();
-        assert_eq!();
-        assert_eq!();
-        assert_eq!();
-    }
-}

exercises/17_tests/tests3.rs

@@ -1,49 +0,0 @@
-struct Rectangle {
-    width: i32,
-    height: i32,
-}
-
-impl Rectangle {
-    // Don't change this function.
-    fn new(width: i32, height: i32) -> Self {
-        if width <= 0 || height <= 0 {
-            // Returning a `Result` would be better here. But we want to learn
-            // how to test functions that can panic.
-            panic!("Rectangle width and height must be positive");
-        }
-
-        Rectangle { width, height }
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn correct_width_and_height() {
-        // TODO: This test should check if the rectangle has the size that we
-        // pass to its constructor.
-        let rect = Rectangle::new(10, 20);
-        assert_eq!(todo!(), 10); // Check width
-        assert_eq!(todo!(), 20); // Check height
-    }
-
-    // TODO: This test should check if the program panics when we try to create
-    // a rectangle with negative width.
-    #[test]
-    fn negative_width() {
-        let _rect = Rectangle::new(-10, 10);
-    }
-
-    // TODO: This test should check if the program panics when we try to create
-    // a rectangle with negative height.
-    #[test]
-    fn negative_height() {
-        let _rect = Rectangle::new(10, -10);
-    }
-}

exercises/18_iterators/iterators1.rs

@@ -1,25 +0,0 @@
-// When performing operations on elements within a collection, iterators are
-// essential. This module helps you get familiar with the structure of using an
-// iterator and how to go through elements within an iterable collection.
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn iterators() {
-        let my_fav_fruits = ["banana", "custard apple", "avocado", "peach", "raspberry"];
-
-        // TODO: Create an iterator over the array.
-        let mut fav_fruits_iterator = todo!();
-
-        assert_eq!(fav_fruits_iterator.next(), Some(&"banana"));
-        assert_eq!(fav_fruits_iterator.next(), todo!()); // TODO: Replace `todo!()`
-        assert_eq!(fav_fruits_iterator.next(), Some(&"avocado"));
-        assert_eq!(fav_fruits_iterator.next(), todo!()); // TODO: Replace `todo!()`
-        assert_eq!(fav_fruits_iterator.next(), Some(&"raspberry"));
-        assert_eq!(fav_fruits_iterator.next(), todo!()); // TODO: Replace `todo!()`
-    }
-}

exercises/18_iterators/iterators2.rs

@@ -1,57 +0,0 @@
-// In this exercise, you'll learn some of the unique advantages that iterators
-// can offer.
-
-// TODO: Complete the `capitalize_first` function.
-// "hello" -> "Hello"
-fn capitalize_first(input: &str) -> String {
-    let mut chars = input.chars();
-    match chars.next() {
-        None => String::new(),
-        Some(first) => todo!(),
-    }
-}
-
-// TODO: Apply the `capitalize_first` function to a slice of string slices.
-// Return a vector of strings.
-// ["hello", "world"] -> ["Hello", "World"]
-fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
-    // ???
-}
-
-// TODO: Apply the `capitalize_first` function again to a slice of string
-// slices. Return a single string.
-// ["hello", " ", "world"] -> "Hello World"
-fn capitalize_words_string(words: &[&str]) -> String {
-    // ???
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_success() {
-        assert_eq!(capitalize_first("hello"), "Hello");
-    }
-
-    #[test]
-    fn test_empty() {
-        assert_eq!(capitalize_first(""), "");
-    }
-
-    #[test]
-    fn test_iterate_string_vec() {
-        let words = vec!["hello", "world"];
-        assert_eq!(capitalize_words_vector(&words), ["Hello", "World"]);
-    }
-
-    #[test]
-    fn test_iterate_into_string() {
-        let words = vec!["hello", " ", "world"];
-        assert_eq!(capitalize_words_string(&words), "Hello World");
-    }
-}

exercises/18_iterators/iterators3.rs

@@ -1,73 +0,0 @@
-#[derive(Debug, PartialEq, Eq)]
-enum DivisionError {
-    // Example: 42 / 0
-    DivideByZero,
-    // Only case for `i64`: `i64::MIN / -1` because the result is `i64::MAX + 1`
-    IntegerOverflow,
-    // Example: 5 / 2 = 2.5
-    NotDivisible,
-}
-
-// TODO: Calculate `a` divided by `b` if `a` is evenly divisible by `b`.
-// Otherwise, return a suitable error.
-fn divide(a: i64, b: i64) -> Result<i64, DivisionError> {
-    todo!();
-}
-
-// TODO: Add the correct return type and complete the function body.
-// Desired output: `Ok([1, 11, 1426, 3])`
-fn result_with_list() {
-    let numbers = [27, 297, 38502, 81];
-    let division_results = numbers.into_iter().map(|n| divide(n, 27));
-}
-
-// TODO: Add the correct return type and complete the function body.
-// Desired output: `[Ok(1), Ok(11), Ok(1426), Ok(3)]`
-fn list_of_results() {
-    let numbers = [27, 297, 38502, 81];
-    let division_results = numbers.into_iter().map(|n| divide(n, 27));
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_success() {
-        assert_eq!(divide(81, 9), Ok(9));
-    }
-
-    #[test]
-    fn test_divide_by_0() {
-        assert_eq!(divide(81, 0), Err(DivisionError::DivideByZero));
-    }
-
-    #[test]
-    fn test_integer_overflow() {
-        assert_eq!(divide(i64::MIN, -1), Err(DivisionError::IntegerOverflow));
-    }
-
-    #[test]
-    fn test_not_divisible() {
-        assert_eq!(divide(81, 6), Err(DivisionError::NotDivisible));
-    }
-
-    #[test]
-    fn test_divide_0_by_something() {
-        assert_eq!(divide(0, 81), Ok(0));
-    }
-
-    #[test]
-    fn test_result_with_list() {
-        assert_eq!(result_with_list().unwrap(), [1, 11, 1426, 3]);
-    }
-
-    #[test]
-    fn test_list_of_results() {
-        assert_eq!(list_of_results(), [Ok(1), Ok(11), Ok(1426), Ok(3)]);
-    }
-}

exercises/18_iterators/iterators4.rs

@@ -1,41 +0,0 @@
-fn factorial(num: u64) -> u64 {
-    // TODO: Complete this function to return the factorial of `num` which is
-    // defined as `1 * 2 * 3 * … * num`.
-    // https://en.wikipedia.org/wiki/Factorial
-    //
-    // Do not use:
-    // - early returns (using the `return` keyword explicitly)
-    // Try not to use:
-    // - imperative style loops (for/while)
-    // - additional variables
-    // For an extra challenge, don't use:
-    // - recursion
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn factorial_of_0() {
-        assert_eq!(factorial(0), 1);
-    }
-
-    #[test]
-    fn factorial_of_1() {
-        assert_eq!(factorial(1), 1);
-    }
-    #[test]
-    fn factorial_of_2() {
-        assert_eq!(factorial(2), 2);
-    }
-
-    #[test]
-    fn factorial_of_4() {
-        assert_eq!(factorial(4), 24);
-    }
-}

exercises/19_smart_pointers/arc1.rs

@@ -1,45 +0,0 @@
-// In this exercise, we are given a `Vec` of `u32` called `numbers` with values
-// ranging from 0 to 99. We would like to use this set of numbers within 8
-// different threads simultaneously. Each thread is going to get the sum of
-// every eighth value with an offset.
-//
-// The first thread (offset 0), will sum 0, 8, 16, …
-// The second thread (offset 1), will sum 1, 9, 17, …
-// The third thread (offset 2), will sum 2, 10, 18, …
-// …
-// The eighth thread (offset 7), will sum 7, 15, 23, …
-//
-// Each thread should own a reference-counting pointer to the vector of
-// numbers. But `Rc` isn't thread-safe. Therefore, we need to use `Arc`.
-//
-// Don't get distracted by how threads are spawned and joined. We will practice
-// that later in the exercises about threads.
-
-// Don't change the lines below.
-#![forbid(unused_imports)]
-use std::{sync::Arc, thread};
-
-fn main() {
-    let numbers: Vec<_> = (0..100u32).collect();
-
-    // TODO: Define `shared_numbers` by using `Arc`.
-    // let shared_numbers = ???;
-
-    let mut join_handles = Vec::new();
-
-    for offset in 0..8 {
-        // TODO: Define `child_numbers` using `shared_numbers`.
-        // let child_numbers = ???;
-
-        let handle = thread::spawn(move || {
-            let sum: u32 = child_numbers.iter().filter(|&&n| n % 8 == offset).sum();
-            println!("Sum of offset {offset} is {sum}");
-        });
-
-        join_handles.push(handle);
-    }
-
-    for handle in join_handles.into_iter() {
-        handle.join().unwrap();
-    }
-}

exercises/19_smart_pointers/box1.rs

@@ -1,50 +0,0 @@
-// At compile time, Rust needs to know how much space a type takes up. This
-// becomes problematic for recursive types, where a value can have as part of
-// itself another value of the same type. To get around the issue, we can use a
-// `Box` - a smart pointer used to store data on the heap, which also allows us
-// to wrap a recursive type.
-//
-// The recursive type we're implementing in this exercise is the "cons list", a
-// data structure frequently found in functional programming languages. Each
-// item in a cons list contains two elements: The value of the current item and
-// the next item. The last item is a value called `Nil`.
-
-// TODO: Use a `Box` in the enum definition to make the code compile.
-#[derive(PartialEq, Debug)]
-enum List {
-    Cons(i32, List),
-    Nil,
-}
-
-// TODO: Create an empty cons list.
-fn create_empty_list() -> List {
-    todo!()
-}
-
-// TODO: Create a non-empty cons list.
-fn create_non_empty_list() -> List {
-    todo!()
-}
-
-fn main() {
-    println!("This is an empty cons list: {:?}", create_empty_list());
-    println!(
-        "This is a non-empty cons list: {:?}",
-        create_non_empty_list(),
-    );
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_create_empty_list() {
-        assert_eq!(create_empty_list(), List::Nil);
-    }
-
-    #[test]
-    fn test_create_non_empty_list() {
-        assert_ne!(create_empty_list(), create_non_empty_list());
-    }
-}

exercises/19_smart_pointers/cow1.rs

@@ -1,69 +0,0 @@
-// This exercise explores the `Cow` (Clone-On-Write) smart pointer. It can
-// enclose and provide immutable access to borrowed data and clone the data
-// lazily when mutation or ownership is required. The type is designed to work
-// with general borrowed data via the `Borrow` trait.
-
-use std::borrow::Cow;
-
-fn abs_all(input: &mut Cow<[i32]>) {
-    for ind in 0..input.len() {
-        let value = input[ind];
-        if value < 0 {
-            // Clones into a vector if not already owned.
-            input.to_mut()[ind] = -value;
-        }
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn reference_mutation() {
-        // Clone occurs because `input` needs to be mutated.
-        let vec = vec![-1, 0, 1];
-        let mut input = Cow::from(&vec);
-        abs_all(&mut input);
-        assert!(matches!(input, Cow::Owned(_)));
-    }
-
-    #[test]
-    fn reference_no_mutation() {
-        // No clone occurs because `input` doesn't need to be mutated.
-        let vec = vec![0, 1, 2];
-        let mut input = Cow::from(&vec);
-        abs_all(&mut input);
-        // TODO: Replace `todo!()` with `Cow::Owned(_)` or `Cow::Borrowed(_)`.
-        assert!(matches!(input, todo!()));
-    }
-
-    #[test]
-    fn owned_no_mutation() {
-        // We can also pass `vec` without `&` so `Cow` owns it directly. In this
-        // case, no mutation occurs (all numbers are already absolute) and thus
-        // also no clone. But the result is still owned because it was never
-        // borrowed or mutated.
-        let vec = vec![0, 1, 2];
-        let mut input = Cow::from(vec);
-        abs_all(&mut input);
-        // TODO: Replace `todo!()` with `Cow::Owned(_)` or `Cow::Borrowed(_)`.
-        assert!(matches!(input, todo!()));
-    }
-
-    #[test]
-    fn owned_mutation() {
-        // Of course this is also the case if a mutation does occur (not all
-        // numbers are absolute). In this case, the call to `to_mut()` in the
-        // `abs_all` function returns a reference to the same data as before.
-        let vec = vec![-1, 0, 1];
-        let mut input = Cow::from(vec);
-        abs_all(&mut input);
-        // TODO: Replace `todo!()` with `Cow::Owned(_)` or `Cow::Borrowed(_)`.
-        assert!(matches!(input, todo!()));
-    }
-}

exercises/19_smart_pointers/rc1.rs

@@ -1,105 +0,0 @@
-// In this exercise, we want to express the concept of multiple owners via the
-// `Rc<T>` type. This is a model of our solar system - there is a `Sun` type and
-// multiple `Planet`s. The planets take ownership of the sun, indicating that
-// they revolve around the sun.
-
-use std::rc::Rc;
-
-#[derive(Debug)]
-struct Sun;
-
-#[derive(Debug)]
-enum Planet {
-    Mercury(Rc<Sun>),
-    Venus(Rc<Sun>),
-    Earth(Rc<Sun>),
-    Mars(Rc<Sun>),
-    Jupiter(Rc<Sun>),
-    Saturn(Rc<Sun>),
-    Uranus(Rc<Sun>),
-    Neptune(Rc<Sun>),
-}
-
-impl Planet {
-    fn details(&self) {
-        println!("Hi from {self:?}!");
-    }
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn rc1() {
-        let sun = Rc::new(Sun);
-        println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
-
-        let mercury = Planet::Mercury(Rc::clone(&sun));
-        println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
-        mercury.details();
-
-        let venus = Planet::Venus(Rc::clone(&sun));
-        println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
-        venus.details();
-
-        let earth = Planet::Earth(Rc::clone(&sun));
-        println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
-        earth.details();
-
-        let mars = Planet::Mars(Rc::clone(&sun));
-        println!("reference count = {}", Rc::strong_count(&sun)); // 5 references
-        mars.details();
-
-        let jupiter = Planet::Jupiter(Rc::clone(&sun));
-        println!("reference count = {}", Rc::strong_count(&sun)); // 6 references
-        jupiter.details();
-
-        // TODO
-        let saturn = Planet::Saturn(Rc::new(Sun));
-        println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
-        saturn.details();
-
-        // TODO
-        let uranus = Planet::Uranus(Rc::new(Sun));
-        println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
-        uranus.details();
-
-        // TODO
-        let neptune = Planet::Neptune(Rc::new(Sun));
-        println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
-        neptune.details();
-
-        assert_eq!(Rc::strong_count(&sun), 9);
-
-        drop(neptune);
-        println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
-
-        drop(uranus);
-        println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
-
-        drop(saturn);
-        println!("reference count = {}", Rc::strong_count(&sun)); // 6 references
-
-        drop(jupiter);
-        println!("reference count = {}", Rc::strong_count(&sun)); // 5 references
-
-        drop(mars);
-        println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
-
-        // TODO
-        println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
-
-        // TODO
-        println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
-
-        // TODO
-        println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
-
-        assert_eq!(Rc::strong_count(&sun), 1);
-    }
-}

exercises/20_threads/threads1.rs

@@ -1,37 +0,0 @@
-// This program spawns multiple threads that each runs for at least 250ms, and
-// each thread returns how much time it took to complete. The program should
-// wait until all the spawned threads have finished and should collect their
-// return values into a vector.
-
-use std::{
-    thread,
-    time::{Duration, Instant},
-};
-
-fn main() {
-    let mut handles = Vec::new();
-    for i in 0..10 {
-        let handle = thread::spawn(move || {
-            let start = Instant::now();
-            thread::sleep(Duration::from_millis(250));
-            println!("Thread {i} done");
-            start.elapsed().as_millis()
-        });
-        handles.push(handle);
-    }
-
-    let mut results = Vec::new();
-    for handle in handles {
-        // TODO: Collect the results of all threads into the `results` vector.
-        // Use the `JoinHandle` struct which is returned by `thread::spawn`.
-    }
-
-    if results.len() != 10 {
-        panic!("Oh no! Some thread isn't done yet!");
-    }
-
-    println!();
-    for (i, result) in results.into_iter().enumerate() {
-        println!("Thread {i} took {result}ms");
-    }
-}

exercises/20_threads/threads2.rs

@@ -1,34 +0,0 @@
-// Building on the last exercise, we want all of the threads to complete their
-// work. But this time, the spawned threads need to be in charge of updating a
-// shared value: `JobStatus.jobs_done`
-
-use std::{sync::Arc, thread, time::Duration};
-
-struct JobStatus {
-    jobs_done: u32,
-}
-
-fn main() {
-    // TODO: `Arc` isn't enough if you want a **mutable** shared state.
-    let status = Arc::new(JobStatus { jobs_done: 0 });
-
-    let mut handles = Vec::new();
-    for _ in 0..10 {
-        let status_shared = Arc::clone(&status);
-        let handle = thread::spawn(move || {
-            thread::sleep(Duration::from_millis(250));
-
-            // TODO: You must take an action before you update a shared value.
-            status_shared.jobs_done += 1;
-        });
-        handles.push(handle);
-    }
-
-    // Waiting for all jobs to complete.
-    for handle in handles {
-        handle.join().unwrap();
-    }
-
-    // TODO: Print the value of `JobStatus.jobs_done`.
-    println!("Jobs done: {}", todo!());
-}

exercises/20_threads/threads3.rs

@@ -1,60 +0,0 @@
-use std::{sync::mpsc, thread, time::Duration};
-
-struct Queue {
-    first_half: Vec<u32>,
-    second_half: Vec<u32>,
-}
-
-impl Queue {
-    fn new() -> Self {
-        Self {
-            first_half: vec![1, 2, 3, 4, 5],
-            second_half: vec![6, 7, 8, 9, 10],
-        }
-    }
-}
-
-fn send_tx(q: Queue, tx: mpsc::Sender<u32>) {
-    // TODO: We want to send `tx` to both threads. But currently, it is moved
-    // into the first thread. How could you solve this problem?
-    thread::spawn(move || {
-        for val in q.first_half {
-            println!("Sending {val:?}");
-            tx.send(val).unwrap();
-            thread::sleep(Duration::from_millis(250));
-        }
-    });
-
-    thread::spawn(move || {
-        for val in q.second_half {
-            println!("Sending {val:?}");
-            tx.send(val).unwrap();
-            thread::sleep(Duration::from_millis(250));
-        }
-    });
-}
-
-fn main() {
-    // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn threads3() {
-        let (tx, rx) = mpsc::channel();
-        let queue = Queue::new();
-
-        send_tx(queue, tx);
-
-        let mut received = Vec::with_capacity(10);
-        for value in rx {
-            received.push(value);
-        }
-
-        received.sort();
-        assert_eq!(received, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
-    }
-}

exercises/21_macros/macros3.rs

@@ -1,13 +0,0 @@
-// TODO: Fix the compiler error without taking the macro definition out of this
-// module.
-mod macros {
-    macro_rules! my_macro {
-        () => {
-            println!("Check out my macro!");
-        };
-    }
-}
-
-fn main() {
-    my_macro!();
-}

exercises/22_clippy/clippy1.rs

@@ -1,15 +0,0 @@
-// The Clippy tool is a collection of lints to analyze your code so you can
-// catch common mistakes and improve your Rust code.
-//
-// For these exercises, the code will fail to compile when there are Clippy
-// warnings. Check Clippy's suggestions from the output to solve the exercise.
-
-fn main() {
-    // TODO: Fix the Clippy lint in this line.
-    let pi = 3.14;
-    let radius: f32 = 5.0;
-
-    let area = pi * radius.powi(2);
-
-    println!("The area of a circle with radius {radius:.2} is {area:.5}");
-}

exercises/22_clippy/clippy2.rs

@@ -1,10 +0,0 @@
-fn main() {
-    let mut res = 42;
-    let option = Some(12);
-    // TODO: Fix the Clippy lint.
-    for x in option {
-        res += x;
-    }
-
-    println!("{res}");
-}

exercises/22_clippy/clippy3.rs

@@ -1,29 +0,0 @@
-// Here are some more easy Clippy fixes so you can see its utility 📎
-// TODO: Fix all the Clippy lints.
-
-#[rustfmt::skip]
-#[allow(unused_variables, unused_assignments)]
-fn main() {
-    let my_option: Option<&str> = None;
-    // Assume that you don't know the value of `my_option`.
-    // In the case of `Some`, we want to print its value.
-    if my_option.is_none() {
-        println!("{}", my_option.unwrap());
-    }
-
-    let my_arr = &[
-        -1, -2, -3
-        -4, -5, -6
-    ];
-    println!("My array! Here it is: {my_arr:?}");
-
-    let my_empty_vec = vec![1, 2, 3, 4, 5].resize(0, 5);
-    println!("This Vec is empty, see? {my_empty_vec:?}");
-
-    let mut value_a = 45;
-    let mut value_b = 66;
-    // Let's swap these two!
-    value_a = value_b;
-    value_b = value_a;
-    println!("value a: {value_a}; value b: {value_b}");
-}

exercises/23_conversions/from_str.rs

@@ -1,113 +0,0 @@
-// This is similar to the previous `from_into` exercise. But this time, we'll
-// implement `FromStr` and return errors instead of falling back to a default
-// value. Additionally, upon implementing `FromStr`, you can use the `parse`
-// method on strings to generate an object of the implementor type. You can read
-// more about it in the documentation:
-// https://doc.rust-lang.org/std/str/trait.FromStr.html
-
-use std::num::ParseIntError;
-use std::str::FromStr;
-
-#[derive(Debug, PartialEq)]
-struct Person {
-    name: String,
-    age: u8,
-}
-
-// We will use this error type for the `FromStr` implementation.
-#[derive(Debug, PartialEq)]
-enum ParsePersonError {
-    // Incorrect number of fields
-    BadLen,
-    // Empty name field
-    NoName,
-    // Wrapped error from parse::<u8>()
-    ParseInt(ParseIntError),
-}
-
-// TODO: Complete this `FromStr` implementation to be able to parse a `Person`
-// out of a string in the form of "Mark,20".
-// Note that you'll need to parse the age component into a `u8` with something
-// like `"4".parse::<u8>()`.
-//
-// Steps:
-// 1. Split the given string on the commas present in it.
-// 2. If the split operation returns less or more than 2 elements, return the
-//    error `ParsePersonError::BadLen`.
-// 3. Use the first element from the split operation as the name.
-// 4. If the name is empty, return the error `ParsePersonError::NoName`.
-// 5. Parse the second element from the split operation into a `u8` as the age.
-// 6. If parsing the age fails, return the error `ParsePersonError::ParseInt`.
-impl FromStr for Person {
-    type Err = ParsePersonError;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {}
-}
-
-fn main() {
-    let p = "Mark,20".parse::<Person>();
-    println!("{p:?}");
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use ParsePersonError::*;
-
-    #[test]
-    fn empty_input() {
-        assert_eq!("".parse::<Person>(), Err(BadLen));
-    }
-
-    #[test]
-    fn good_input() {
-        let p = "John,32".parse::<Person>();
-        assert!(p.is_ok());
-        let p = p.unwrap();
-        assert_eq!(p.name, "John");
-        assert_eq!(p.age, 32);
-    }
-
-    #[test]
-    fn missing_age() {
-        assert!(matches!("John,".parse::<Person>(), Err(ParseInt(_))));
-    }
-
-    #[test]
-    fn invalid_age() {
-        assert!(matches!("John,twenty".parse::<Person>(), Err(ParseInt(_))));
-    }
-
-    #[test]
-    fn missing_comma_and_age() {
-        assert_eq!("John".parse::<Person>(), Err(BadLen));
-    }
-
-    #[test]
-    fn missing_name() {
-        assert_eq!(",1".parse::<Person>(), Err(NoName));
-    }
-
-    #[test]
-    fn missing_name_and_age() {
-        assert!(matches!(",".parse::<Person>(), Err(NoName | ParseInt(_))));
-    }
-
-    #[test]
-    fn missing_name_and_invalid_age() {
-        assert!(matches!(
-            ",one".parse::<Person>(),
-            Err(NoName | ParseInt(_)),
-        ));
-    }
-
-    #[test]
-    fn trailing_comma() {
-        assert_eq!("John,32,".parse::<Person>(), Err(BadLen));
-    }
-
-    #[test]
-    fn trailing_comma_and_some_string() {
-        assert_eq!("John,32,man".parse::<Person>(), Err(BadLen));
-    }
-}

exercises/23_conversions/try_from_into.rs

@@ -1,177 +0,0 @@
-// `TryFrom` is a simple and safe type conversion that may fail in a controlled
-// way under some circumstances. Basically, this is the same as `From`. The main
-// difference is that this should return a `Result` type instead of the target
-// type itself. You can read more about it in the documentation:
-// https://doc.rust-lang.org/std/convert/trait.TryFrom.html
-
-#![allow(clippy::useless_vec)]
-use std::convert::{TryFrom, TryInto};
-
-#[derive(Debug, PartialEq)]
-struct Color {
-    red: u8,
-    green: u8,
-    blue: u8,
-}
-
-// We will use this error type for the `TryFrom` conversions.
-#[derive(Debug, PartialEq)]
-enum IntoColorError {
-    // Incorrect length of slice
-    BadLen,
-    // Integer conversion error
-    IntConversion,
-}
-
-// TODO: Tuple implementation.
-// Correct RGB color values must be integers in the 0..=255 range.
-impl TryFrom<(i16, i16, i16)> for Color {
-    type Error = IntoColorError;
-
-    fn try_from(tuple: (i16, i16, i16)) -> Result<Self, Self::Error> {}
-}
-
-// TODO: Array implementation.
-impl TryFrom<[i16; 3]> for Color {
-    type Error = IntoColorError;
-
-    fn try_from(arr: [i16; 3]) -> Result<Self, Self::Error> {}
-}
-
-// TODO: Slice implementation.
-// This implementation needs to check the slice length.
-impl TryFrom<&[i16]> for Color {
-    type Error = IntoColorError;
-
-    fn try_from(slice: &[i16]) -> Result<Self, Self::Error> {}
-}
-
-fn main() {
-    // Using the `try_from` function.
-    let c1 = Color::try_from((183, 65, 14));
-    println!("{c1:?}");
-
-    // Since `TryFrom` is implemented for `Color`, we can use `TryInto`.
-    let c2: Result<Color, _> = [183, 65, 14].try_into();
-    println!("{c2:?}");
-
-    let v = vec![183, 65, 14];
-    // With slice we should use the `try_from` function
-    let c3 = Color::try_from(&v[..]);
-    println!("{c3:?}");
-    // or put the slice within round brackets and use `try_into`.
-    let c4: Result<Color, _> = (&v[..]).try_into();
-    println!("{c4:?}");
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use IntoColorError::*;
-
-    #[test]
-    fn test_tuple_out_of_range_positive() {
-        assert_eq!(Color::try_from((256, 1000, 10000)), Err(IntConversion));
-    }
-
-    #[test]
-    fn test_tuple_out_of_range_negative() {
-        assert_eq!(Color::try_from((-1, -10, -256)), Err(IntConversion));
-    }
-
-    #[test]
-    fn test_tuple_sum() {
-        assert_eq!(Color::try_from((-1, 255, 255)), Err(IntConversion));
-    }
-
-    #[test]
-    fn test_tuple_correct() {
-        let c: Result<Color, _> = (183, 65, 14).try_into();
-        assert!(c.is_ok());
-        assert_eq!(
-            c.unwrap(),
-            Color {
-                red: 183,
-                green: 65,
-                blue: 14,
-            }
-        );
-    }
-
-    #[test]
-    fn test_array_out_of_range_positive() {
-        let c: Result<Color, _> = [1000, 10000, 256].try_into();
-        assert_eq!(c, Err(IntConversion));
-    }
-
-    #[test]
-    fn test_array_out_of_range_negative() {
-        let c: Result<Color, _> = [-10, -256, -1].try_into();
-        assert_eq!(c, Err(IntConversion));
-    }
-
-    #[test]
-    fn test_array_sum() {
-        let c: Result<Color, _> = [-1, 255, 255].try_into();
-        assert_eq!(c, Err(IntConversion));
-    }
-
-    #[test]
-    fn test_array_correct() {
-        let c: Result<Color, _> = [183, 65, 14].try_into();
-        assert!(c.is_ok());
-        assert_eq!(
-            c.unwrap(),
-            Color {
-                red: 183,
-                green: 65,
-                blue: 14
-            }
-        );
-    }
-
-    #[test]
-    fn test_slice_out_of_range_positive() {
-        let arr = [10000, 256, 1000];
-        assert_eq!(Color::try_from(&arr[..]), Err(IntConversion));
-    }
-
-    #[test]
-    fn test_slice_out_of_range_negative() {
-        let arr = [-256, -1, -10];
-        assert_eq!(Color::try_from(&arr[..]), Err(IntConversion));
-    }
-
-    #[test]
-    fn test_slice_sum() {
-        let arr = [-1, 255, 255];
-        assert_eq!(Color::try_from(&arr[..]), Err(IntConversion));
-    }
-
-    #[test]
-    fn test_slice_correct() {
-        let v = vec![183, 65, 14];
-        let c: Result<Color, _> = Color::try_from(&v[..]);
-        assert!(c.is_ok());
-        assert_eq!(
-            c.unwrap(),
-            Color {
-                red: 183,
-                green: 65,
-                blue: 14,
-            }
-        );
-    }
-
-    #[test]
-    fn test_slice_excess_length() {
-        let v = vec![0, 0, 0, 0];
-        assert_eq!(Color::try_from(&v[..]), Err(BadLen));
-    }
-
-    #[test]
-    fn test_slice_insufficient_length() {
-        let v = vec![0, 0];
-        assert_eq!(Color::try_from(&v[..]), Err(BadLen));
-    }
-}

exercises/README.md

@@ -17,11 +17,11 @@
 | error_handling         | §9                  |
 | generics               | §10                 |
 | traits                 | §10.2               |
-| lifetimes              | §10.3               |
 | tests                  | §11.1               |
+| lifetimes              | §10.3               |
 | iterators              | §13.2-4             |
-| smart_pointers         | §15, §16.3          |
 | threads                | §16.1-3             |
-| macros                 | §19.5               |
+| smart_pointers         | §15, §16.3          |
+| macros                 | §19.6               |
 | clippy                 | §21.4               |
 | conversions            | n/a                 |

exercises/clippy/clippy1.rs

@@ -0,0 +1,23 @@
+// clippy1.rs
+// The Clippy tool is a collection of lints to analyze your code
+// so you can catch common mistakes and improve your Rust code.
+//
+// For these exercises the code will fail to compile when there are clippy warnings
+// check clippy's suggestions from the output to solve the exercise.
+// Execute `rustlings hint clippy1` or use the `hint` watch subcommand for a hint.
+
+// I AM NOT DONE
+
+use std::f32;
+
+fn main() {
+    let pi = 3.14f32;
+    let radius = 5.00f32;
+
+    let area = pi * f32::powi(radius, 2);
+
+    println!(
+        "The area of a circle with radius {:.2} is {:.5}!",
+        radius, area
+    )
+}

exercises/clippy/clippy2.rs

@@ -0,0 +1,13 @@
+// clippy2.rs
+// Execute `rustlings hint clippy2` or use the `hint` watch subcommand for a hint.
+
+// I AM NOT DONE
+
+fn main() {
+    let mut res = 42;
+    let option = Some(12);
+    for x in option {
+        res += x;
+    }
+    println!("{}", res);
+}

exercises/clippy/clippy3.rs

@@ -0,0 +1,28 @@
+// clippy3.rs
+// Here's a couple more easy Clippy fixes, so you can see its utility.
+
+// I AM NOT DONE
+
+#[allow(unused_variables, unused_assignments)]
+fn main() {
+    let my_option: Option<()> = None;
+    if my_option.is_none() {
+        my_option.unwrap();
+    }
+
+    let my_arr = &[
+        -1, -2, -3
+        -4, -5, -6
+    ];
+    println!("My array! Here it is: {:?}", my_arr);
+
+    let my_empty_vec = vec![1, 2, 3, 4, 5].resize(0, 5);
+    println!("This Vec is empty, see? {:?}", my_empty_vec);
+
+    let mut value_a = 45;
+    let mut value_b = 66;
+    // Let's swap these two!
+    value_a = value_b;
+    value_b = value_a;
+    println!("value a: {}; value b: {}", value_a, value_b);
+}

exercises/conversions/README.md

@@ -6,7 +6,6 @@ The simplest form of type conversion is a type cast expression. It is denoted wi
 
 Rust also offers traits that facilitate type conversions upon implementation. These traits can be found under the [`convert`](https://doc.rust-lang.org/std/convert/index.html) module.
 The traits are the following:
-
 - `From` and `Into` covered in [`from_into`](from_into.rs)
 - `TryFrom` and `TryInto` covered in [`try_from_into`](try_from_into.rs)
 - `AsRef` and `AsMut` covered in [`as_ref_mut`](as_ref_mut.rs)
@@ -18,6 +17,5 @@ These should be the main ways ***within the standard library*** to convert data
 ## Further information
 
 These are not directly covered in the book, but the standard library has a great documentation for it.
-
 - [conversions](https://doc.rust-lang.org/std/convert/index.html)
-- [`FromStr` trait](https://doc.rust-lang.org/std/str/trait.FromStr.html)
+- [`FromStr` trait](https://doc.rust-lang.org/std/str/trait.FromStr.html)

exercises/conversions/as_ref_mut.rs

@@ -1,28 +1,27 @@
-// AsRef and AsMut allow for cheap reference-to-reference conversions. Read more
-// about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html and
-// https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
+// AsRef and AsMut allow for cheap reference-to-reference conversions.
+// Read more about them at https://doc.rust-lang.org/std/convert/trait.AsRef.html
+// and https://doc.rust-lang.org/std/convert/trait.AsMut.html, respectively.
+// Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a hint.
 
-// Obtain the number of bytes (not characters) in the given argument
-// (`.len()` returns the number of bytes in a string).
-// TODO: Add the `AsRef` trait appropriately as a trait bound.
+// I AM NOT DONE
+
+// Obtain the number of bytes (not characters) in the given argument.
+// TODO: Add the AsRef trait appropriately as a trait bound.
 fn byte_counter<T>(arg: T) -> usize {
-    arg.as_ref().len()
+    arg.as_ref().as_bytes().len()
 }
 
 // Obtain the number of characters (not bytes) in the given argument.
-// TODO: Add the `AsRef` trait appropriately as a trait bound.
+// TODO: Add the AsRef trait appropriately as a trait bound.
 fn char_counter<T>(arg: T) -> usize {
     arg.as_ref().chars().count()
 }
 
-// Squares a number using `as_mut()`.
+// Squares a number using as_mut().
 // TODO: Add the appropriate trait bound.
 fn num_sq<T>(arg: &mut T) {
     // TODO: Implement the function body.
-}
-
-fn main() {
-    // You can optionally experiment here.
+    ???
 }
 
 #[cfg(test)]
@@ -54,7 +53,7 @@ mod tests {
     }
 
     #[test]
-    fn mut_box() {
+    fn mult_box() {
         let mut num: Box<u32> = Box::new(3);
         num_sq(&mut num);
         assert_eq!(*num, 9);

exercises/conversions/from_into.rs

@@ -1,79 +1,83 @@
-// The `From` trait is used for value-to-value conversions. If `From` is
-// implemented, an implementation of `Into` is automatically provided.
-// You can read more about it in the documentation:
-// https://doc.rust-lang.org/std/convert/trait.From.html
+// The From trait is used for value-to-value conversions.
+// If From is implemented correctly for a type, the Into trait should work conversely.
+// You can read more about it at https://doc.rust-lang.org/std/convert/trait.From.html
+// Execute `rustlings hint from_into` or use the `hint` watch subcommand for a hint.
 
 #[derive(Debug)]
 struct Person {
     name: String,
-    age: u8,
+    age: usize,
 }
 
-// We implement the Default trait to use it as a fallback when the provided
-// string is not convertible into a `Person` object.
+// We implement the Default trait to use it as a fallback
+// when the provided string is not convertible into a Person object
 impl Default for Person {
-    fn default() -> Self {
-        Self {
+    fn default() -> Person {
+        Person {
             name: String::from("John"),
             age: 30,
         }
     }
 }
 
-// TODO: Complete this `From` implementation to be able to parse a `Person`
-// out of a string in the form of "Mark,20".
-// Note that you'll need to parse the age component into a `u8` with something
-// like `"4".parse::<u8>()`.
+// Your task is to complete this implementation
+// in order for the line `let p = Person::from("Mark,20")` to compile
+// Please note that you'll need to parse the age component into a `usize`
+// with something like `"4".parse::<usize>()`. The outcome of this needs to
+// be handled appropriately.
 //
 // Steps:
-// 1. Split the given string on the commas present in it.
-// 2. If the split operation returns less or more than 2 elements, return the
-//    default of `Person`.
-// 3. Use the first element from the split operation as the name.
-// 4. If the name is empty, return the default of `Person`.
-// 5. Parse the second element from the split operation into a `u8` as the age.
-// 6. If parsing the age fails, return the default of `Person`.
+// 1. If the length of the provided string is 0, then return the default of Person
+// 2. Split the given string on the commas present in it
+// 3. Extract the first element from the split operation and use it as the name
+// 4. If the name is empty, then return the default of Person
+// 5. Extract the other element from the split operation and parse it into a `usize` as the age
+// If while parsing the age, something goes wrong, then return the default of Person
+// Otherwise, then return an instantiated Person object with the results
+
+// I AM NOT DONE
+
 impl From<&str> for Person {
-    fn from(s: &str) -> Self {}
+    fn from(s: &str) -> Person {
+    }
 }
 
 fn main() {
-    // Use the `from` function.
+    // Use the `from` function
     let p1 = Person::from("Mark,20");
-    println!("{p1:?}");
-
-    // Since `From` is implemented for Person, we are able to use `Into`.
+    // Since From is implemented for Person, we should be able to use Into
     let p2: Person = "Gerald,70".into();
-    println!("{p2:?}");
+    println!("{:?}", p1);
+    println!("{:?}", p2);
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
-
     #[test]
     fn test_default() {
+        // Test that the default person is 30 year old John
         let dp = Person::default();
         assert_eq!(dp.name, "John");
         assert_eq!(dp.age, 30);
     }
-
     #[test]
     fn test_bad_convert() {
+        // Test that John is returned when bad string is provided
         let p = Person::from("");
         assert_eq!(p.name, "John");
         assert_eq!(p.age, 30);
     }
-
     #[test]
     fn test_good_convert() {
+        // Test that "Mark,20" works
         let p = Person::from("Mark,20");
         assert_eq!(p.name, "Mark");
         assert_eq!(p.age, 20);
     }
-
     #[test]
     fn test_bad_age() {
+        // Test that "Mark,twenty" will return the default person due to an error in parsing age
         let p = Person::from("Mark,twenty");
         assert_eq!(p.name, "John");
         assert_eq!(p.age, 30);
@@ -123,7 +127,7 @@ mod tests {
 
     #[test]
     fn test_trailing_comma_and_some_string() {
-        let p: Person = Person::from("Mike,32,dog");
+        let p: Person = Person::from("Mike,32,man");
         assert_eq!(p.name, "John");
         assert_eq!(p.age, 30);
     }

exercises/conversions/from_str.rs

@@ -0,0 +1,127 @@
+// from_str.rs
+// This is similar to from_into.rs, but this time we'll implement `FromStr`
+// and return errors instead of falling back to a default value.
+// Additionally, upon implementing FromStr, you can use the `parse` method
+// on strings to generate an object of the implementor type.
+// You can read more about it at https://doc.rust-lang.org/std/str/trait.FromStr.html
+// Execute `rustlings hint from_str` or use the `hint` watch subcommand for a hint.
+
+use std::num::ParseIntError;
+use std::str::FromStr;
+
+#[derive(Debug, PartialEq)]
+struct Person {
+    name: String,
+    age: usize,
+}
+
+// We will use this error type for the `FromStr` implementation.
+#[derive(Debug, PartialEq)]
+enum ParsePersonError {
+    // Empty input string
+    Empty,
+    // Incorrect number of fields
+    BadLen,
+    // Empty name field
+    NoName,
+    // Wrapped error from parse::<usize>()
+    ParseInt(ParseIntError),
+}
+
+// I AM NOT DONE
+
+// Steps:
+// 1. If the length of the provided string is 0, an error should be returned
+// 2. Split the given string on the commas present in it
+// 3. Only 2 elements should be returned from the split, otherwise return an error
+// 4. Extract the first element from the split operation and use it as the name
+// 5. Extract the other element from the split operation and parse it into a `usize` as the age
+//    with something like `"4".parse::<usize>()`
+// 6. If while extracting the name and the age something goes wrong, an error should be returned
+// If everything goes well, then return a Result of a Person object
+//
+// As an aside: `Box<dyn Error>` implements `From<&'_ str>`. This means that if you want to return a
+// string error message, you can do so via just using return `Err("my error message".into())`.
+
+impl FromStr for Person {
+    type Err = ParsePersonError;
+    fn from_str(s: &str) -> Result<Person, Self::Err> {
+    }
+}
+
+fn main() {
+    let p = "Mark,20".parse::<Person>().unwrap();
+    println!("{:?}", p);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn empty_input() {
+        assert_eq!("".parse::<Person>(), Err(ParsePersonError::Empty));
+    }
+    #[test]
+    fn good_input() {
+        let p = "John,32".parse::<Person>();
+        assert!(p.is_ok());
+        let p = p.unwrap();
+        assert_eq!(p.name, "John");
+        assert_eq!(p.age, 32);
+    }
+    #[test]
+    fn missing_age() {
+        assert!(matches!(
+            "John,".parse::<Person>(),
+            Err(ParsePersonError::ParseInt(_))
+        ));
+    }
+
+    #[test]
+    fn invalid_age() {
+        assert!(matches!(
+            "John,twenty".parse::<Person>(),
+            Err(ParsePersonError::ParseInt(_))
+        ));
+    }
+
+    #[test]
+    fn missing_comma_and_age() {
+        assert_eq!("John".parse::<Person>(), Err(ParsePersonError::BadLen));
+    }
+
+    #[test]
+    fn missing_name() {
+        assert_eq!(",1".parse::<Person>(), Err(ParsePersonError::NoName));
+    }
+
+    #[test]
+    fn missing_name_and_age() {
+        assert!(matches!(
+            ",".parse::<Person>(),
+            Err(ParsePersonError::NoName | ParsePersonError::ParseInt(_))
+        ));
+    }
+
+    #[test]
+    fn missing_name_and_invalid_age() {
+        assert!(matches!(
+            ",one".parse::<Person>(),
+            Err(ParsePersonError::NoName | ParsePersonError::ParseInt(_))
+        ));
+    }
+
+    #[test]
+    fn trailing_comma() {
+        assert_eq!("John,32,".parse::<Person>(), Err(ParsePersonError::BadLen));
+    }
+
+    #[test]
+    fn trailing_comma_and_some_string() {
+        assert_eq!(
+            "John,32,man".parse::<Person>(),
+            Err(ParsePersonError::BadLen)
+        );
+    }
+}