fix 404 error

Smart Pointer Exercises for Box

Readme.md

@@ -69,7 +69,7 @@ We use [mdbook](https://rust-lang.github.io/mdBook/) building our exercises. You
 
 - Clone the repo
 ```shell
-$ git clone git@github.com:sunface/rust-by-practice.git
+$ git clone https://github.com/sunface/rust-by-practice
 ```
 - Install mdbook using Cargo
 ```shell

en/src/basic-types/numbers.md

@@ -120,7 +120,7 @@ fn main() {
 ```
 
 ### Range
-9. 🌟🌟 Two goals: 1. Modify `assert!` to make it work 2. Make `println!` output: 97 - 122
+9. 🌟🌟 Two goals: 1. Modify `assert!` to make it work 2. Make `println!` output list of numbers between 97 and 122
 
 ```rust,editable
 fn main() {

en/src/basic-types/statements-expressions.md

@@ -63,8 +63,8 @@ fn main() {
 }
 
 fn sum(x: i32, y: i32) -> i32 {
-    x + y;
+    x + y
 }
 ```
 
-> You can find the solutions [here](https://github.com/sunface/rust-by-practice)(under the solutions path), but only use it when you need it
+> You can find the solutions [here](https://github.com/sunface/rust-by-practice)(under the solutions path), but only use it when you need it

en/src/compound-types/array.md

@@ -88,7 +88,7 @@ fn main() {
 fn main() {
     let names = [String::from("Sunfei"), "Sunface".to_string()];
     
-    // `Get` returns an Option<T>, it's safe to use
+    // `Get` returns an Option<&T>, it's safe to use
     let name0 = names.get(0).unwrap();
 
     // But indexing is not safe
@@ -99,4 +99,4 @@ fn main() {
 
 ```
 
-> You can find the solutions [here](https://github.com/sunface/rust-by-practice/blob/master/solutions/compound-types/array.md)(under the solutions path), but only use it when you need it
+> You can find the solutions [here](https://github.com/sunface/rust-by-practice/blob/master/solutions/compound-types/array.md)(under the solutions path), but only use it when you need it

en/src/crate-module/module.md

@@ -50,10 +50,10 @@ mod front_of_house {
 
 pub fn eat_at_restaurant() {
     // Call add_to_waitlist with **absolute path**:
-    __.add_to_waitlist();
+    __::add_to_waitlist();
 
     // Call with **relative path** 
-     __.add_to_waitlist();
+     __::add_to_waitlist();
 }
 ```
 
@@ -67,7 +67,7 @@ mod back_of_house {
         // FILL in the blank in three ways
         //1. using keyword `super`
         //2. using absolute path
-        __.serve_order();
+        __::serve_order();
     }
 
     fn cook_order() {}

en/src/functional-programing/iterator.md

@@ -223,7 +223,7 @@ Some of these methods call the method `next`to use up the iterator, so they are
 
 8. 🌟🌟
 
-```rust,edtiable
+```rust,editable
 
 /* Fill in the blank and fix the errors */
 fn main() {

en/src/smart-pointers/box.md

@@ -1 +1,52 @@
 # Box
+
+1. 🌟
+```rust,editable
+// Make it work
+fn main() {
+    // Create a new box `b` that contains the integer 5
+    assert_eq!(*b, 5);
+
+    println!("Success!");
+}
+```
+
+2. 🌟
+```rust,editable
+
+// Make it work
+fn main() {
+    let b = Box::new("Hello");
+    print_boxed_string(b);
+}
+
+fn print_boxed_string(b : _) {
+    println!("{}", b);
+}
+```
+
+3. 🌟
+```rust,editable
+
+// Make it work
+fn main() {
+    let b1 = Box::new(5);
+    let b2 = b1;
+    assert_eq!(_, 5);
+
+    println!("Success!");
+}
+```
+
+4. 🌟
+```rust,editable
+
+// Make it work
+fn main() {
+    // Create a box `b` with an array [1, 2, 3, 4, 5]
+    // Print each integer in `b`
+}
+```
+
+
+> You can find the solutions [here](https://github.com/sunface/rust-by-practice)(under the solutions path), but only use it when you need it

en/src/why-exercise.md

@@ -23,7 +23,7 @@ This book was designed for easily diving into and getting skilled with Rust, and
 
 We use [mdbook](https://rust-lang.github.io/mdBook/) building our exercises. You can run locally with below steps:
 ```shell
-$ git clone git@github.com:sunface/rust-by-practice.git
+$ git clone https://github.com/sunface/rust-by-practice
 $ cargo install mdbook
 $ cd rust-by-practice && mdbook serve en/ 
 ```

solutions/crate-module/module.md

@@ -16,7 +16,7 @@ mod front_of_house {
 
         fn take_payment() {}
 
-        fn complain() {} 
+        fn complain() {}
     }
 }
 ```
@@ -41,7 +41,7 @@ pub mod front_of_house {
 
         // Maybe you don't want the guest hearing the your complaining about them
         // So just make it private
-        fn complain() {} 
+        fn complain() {}
     }
 }
 
@@ -83,8 +83,9 @@ mod back_of_house {
 ```rust
 // in src/lib.rs
 
-mod front_of_house;
-mod back_of_house;
+pub mod front_of_house;
+pub mod back_of_house;
+
 pub fn eat_at_restaurant() -> String {
     front_of_house::hosting::add_to_waitlist();
 
@@ -134,16 +135,14 @@ pub fn take_payment() {}
 
 // Maybe you don't want the guest hearing the your complaining about them
 // So just make it private
-fn complain() {} 
+fn complain() {}
 ```
 
 5.
 
 ```rust
-mod front_of_house;
-
 fn main() {
-    assert_eq!(front_of_house::hosting::seat_at_table(), "sit down please");
-    assert_eq!(hello_package::eat_at_restaurant(),"yummy yummy!");
+    assert_eq!(hello_package::front_of_house::hosting::seat_at_table(), "sit down please");
+    assert_eq!(hello_package::eat_at_restaurant(), "yummy yummy!");
 }
 ```

solutions/functional-programing/closure.md

@@ -118,7 +118,7 @@ fn main() {
 ```rust
 fn fn_once<F>(func: F)
 where
-    F: FnOnce(usize) -> bool + Copy,// 改动在这里
+    F: Copy + FnOnce(usize) -> bool,// 改动在这里
 {
     println!("{}", func(3));
     println!("{}", func(4));
@@ -293,4 +293,4 @@ fn factory(x:i32) -> Box<dyn Fn(i32) -> i32> {
 }
 
 fn main() {}
-```
+```

solutions/ownership/borrowing.md

@@ -149,6 +149,6 @@ fn main() {
 
     // add one line below to make a compiler error: cannot borrow `s` as mutable more than once at a time
     // you can't use r1 and r2 at the same time
-    r1.push_str("world");
+    println!("{}, {}", r1, r2);
 }
-```
+```

solutions/ownership/ownership.md

@@ -31,6 +31,15 @@ fn main() {
 }
 ```
 
+```
+fn main() {
+    let x = String::from("hello, world");
+    let y = &x;
+    println!("{},{}",x,y);
+}
+
+```
+
 2.
 
 ```rust
@@ -163,7 +172,18 @@ fn main() {
     let t = (String::from("hello"), String::from("world"));
 
     // fill the blanks
-    let (s1, s2) = t.clone();
+    let (ref s1, ref s2) = t;
+
+    println!("{:?}, {:?}, {:?}", s1, s2, t); // -> "hello", "world", ("hello", "world")
+}
+```
+
+```rust
+fn main() {
+    let t = (String::from("hello"), String::from("world"));
+
+    // fill the blanks
+    let (ref s1, ref s2) = t;
 
     println!("{:?}, {:?}, {:?}", s1, s2, t); // -> "hello", "world", ("hello", "world")
 }

zh-CN/book.toml

@@ -19,4 +19,4 @@ git-repository-url = "https://github.com/sunface/rust-by-practice"
 edit-url-template = "https://github.com/sunface/rust-by-practice/edit/master/zh-CN/{path}"
 
 [rust]
-edition = "2021"
+edition = "2018"

zh-CN/src/lifetime/advance.md

@@ -101,7 +101,7 @@ impl<'a> PartialEq<i32> for &'a T {
 这里只能使用更高级别的约束，因为引用的生命周期比函数上任何可能的生命周期参数都短。
 
 4. 🌟🌟🌟
-```rust
+```rust,editable
 /* 添加 HRTB 使下面代码正常运行！ */
 fn call_on_ref_zero<'a, F>(f: F) where F: Fn(&'a i32) {
     let zero = 0;
@@ -237,7 +237,7 @@ struct Ref<'a, T> {
 ## 艰难的练习
 
 6. 🌟🌟🌟🌟
-```rust
+```rust,editable
 /* 使下面代码正常运行 */
 struct Interface<'a> {
     manager: &'a mut Manager<'a>

zh-CN/src/pattern-match/match-iflet.md

@@ -87,7 +87,7 @@ fn show_message(msg: Message) {
 fn main() {
     let alphabets = ['a', 'E', 'Z', '0', 'x', '9' , 'Y'];
 
-    // 使用 `matches` 填空
+    // 使用 `matches!` 填空
     for ab in alphabets {
         assert!(__)
     }

zh-CN/src/why-exercise.md

@@ -23,7 +23,7 @@
 
 我们使用 [mdbook](https://rust-lang.github.io/mdBook/) 构建在线练习题，你也可以下载到本地运行：
 ```shell
-$ git clone git@github.com:sunface/rust-by-practice.git
+$ git clone https://github.com/sunface/rust-by-practice
 $ cargo install mdbook
 $ cd rust-by-practice && mdbook serve zh-CN/
 ```

zh-CN/theme/index1.hbs

@@ -1,59 +1,62 @@
 <!DOCTYPE HTML>
 <html lang="{{ language }}" class="{{ default_theme }}" dir="{{ text_direction }}">
-    <head>
-        <!-- Book generated using mdBook -->
-        <meta charset="UTF-8">
-        <title>{{ title }}</title>
-        {{#if is_print }}
-        <meta name="robots" content="noindex">
-        {{/if}}
-        {{#if base_url}}
-        <base href="{{ base_url }}">
-        {{/if}}
+
+<head>
+    <!-- Book generated using mdBook -->
+    <meta charset="UTF-8">
+    <title>{{ title }}</title>
+    {{#if is_print }}
+    <meta name="robots" content="noindex">
+    {{/if}}
+    {{#if base_url}}
+    <base href="{{ base_url }}">
+    {{/if}}
 
 
-        <!-- Custom HTML head -->
-        {{> head}}
+    <!-- Custom HTML head -->
+    {{> head}}
 
-        <meta name="description" content="{{ description }}">
-        <meta name="viewport" content="width=device-width, initial-scale=1">
-        <meta name="theme-color" content="#ffffff">
+    <meta name="description" content="{{ description }}">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="theme-color" content="#ffffff">
 
-        {{#if favicon_svg}}
-        <link rel="icon" href="{{ path_to_root }}favicon.svg">
-        {{/if}}
-        {{#if favicon_png}}
-        <link rel="shortcut icon" href="{{ path_to_root }}favicon.png">
-        {{/if}}
-        <link rel="stylesheet" href="{{ path_to_root }}css/variables.css">
-        <link rel="stylesheet" href="{{ path_to_root }}css/general.css">
-        <link rel="stylesheet" href="{{ path_to_root }}css/chrome.css">
-        {{#if print_enable}}
-        <link rel="stylesheet" href="{{ path_to_root }}css/print.css" media="print">
-        {{/if}}
+    {{#if favicon_svg}}
+    <link rel="icon" href="{{ path_to_root }}favicon.svg">
+    {{/if}}
+    {{#if favicon_png}}
+    <link rel="shortcut icon" href="{{ path_to_root }}favicon.png">
+    {{/if}}
+    <link rel="stylesheet" href="{{ path_to_root }}css/variables.css">
+    <link rel="stylesheet" href="{{ path_to_root }}css/general.css">
+    <link rel="stylesheet" href="{{ path_to_root }}css/chrome.css">
+    {{#if print_enable}}
+    <link rel="stylesheet" href="{{ path_to_root }}css/print.css" media="print">
+    {{/if}}
 
-        <!-- Fonts -->
-        <link rel="stylesheet" href="{{ path_to_root }}FontAwesome/css/font-awesome.css">
-        {{#if copy_fonts}}
-        <link rel="stylesheet" href="{{ path_to_root }}fonts/fonts.css">
-        {{/if}}
+    <!-- Fonts -->
+    <link rel="stylesheet" href="{{ path_to_root }}FontAwesome/css/font-awesome.css">
+    {{#if copy_fonts}}
+    <link rel="stylesheet" href="{{ path_to_root }}fonts/fonts.css">
+    {{/if}}
 
-        <!-- Highlight.js Stylesheets -->
-        <link rel="stylesheet" href="{{ path_to_root }}highlight.css">
-        <link rel="stylesheet" href="{{ path_to_root }}tomorrow-night.css">
-        <link rel="stylesheet" href="{{ path_to_root }}ayu-highlight.css">
+    <!-- Highlight.js Stylesheets -->
+    <link rel="stylesheet" href="{{ path_to_root }}highlight.css">
+    <link rel="stylesheet" href="{{ path_to_root }}tomorrow-night.css">
+    <link rel="stylesheet" href="{{ path_to_root }}ayu-highlight.css">
 
-        <!-- Custom theme stylesheets -->
-        {{#each additional_css}}
-        <link rel="stylesheet" href="{{ ../path_to_root }}{{ this }}">
-        {{/each}}
+    <!-- Custom theme stylesheets -->
+    {{#each additional_css}}
+    <link rel="stylesheet" href="{{ ../path_to_root }}{{ this }}">
+    {{/each}}
 
-        {{#if mathjax_support}}
-        <!-- MathJax -->
-        <script async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
-        {{/if}}
-    </head>
-    <body class="sidebar-visible no-js">
+    {{#if mathjax_support}}
+    <!-- MathJax -->
+    <script async
+        src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+    {{/if}}
+</head>
+
+<body class="sidebar-visible no-js">
     <div id="body-container">
         <!-- Provide site root to javascript -->
         <script>
@@ -80,7 +83,7 @@
         <!-- Set the theme before any content is loaded, prevents flash -->
         <script>
             var theme;
-            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            try { theme = localStorage.getItem('mdbook-theme'); } catch (e) { }
             if (theme === null || theme === undefined) { theme = default_theme; }
             var html = document.querySelector('html');
             html.classList.remove('{{ default_theme }}')
@@ -98,7 +101,7 @@
             var sidebar = null;
             var sidebar_toggle = document.getElementById("sidebar-toggle-anchor");
             if (document.body.clientWidth >= 1080) {
-                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
+                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch (e) { }
                 sidebar = sidebar || 'visible';
             } else {
                 sidebar = 'hidden';
@@ -120,7 +123,7 @@
         <!-- Track and set sidebar scroll position -->
         <script>
             var sidebarScrollbox = document.querySelector('#sidebar .sidebar-scrollbox');
-            sidebarScrollbox.addEventListener('click', function(e) {
+            sidebarScrollbox.addEventListener('click', function (e) {
                 if (e.target.tagName === 'A') {
                     sessionStorage.setItem('sidebar-scroll', sidebarScrollbox.scrollTop);
                 }
@@ -138,7 +141,7 @@
                 }
             }
         </script>
-        
+
         <div id="page-wrapper" class="page-wrapper">
 
             <div class="page">
@@ -146,10 +149,14 @@
                 <div id="menu-bar-hover-placeholder"></div>
                 <div id="menu-bar" class="menu-bar sticky">
                     <div class="left-buttons">
-                        <label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
+                        <label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor"
+                            title="Toggle Table of Contents" aria-label="Toggle Table of Contents"
+                            aria-controls="sidebar">
                             <i class="fa fa-bars"></i>
                         </label>
-                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
+                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme"
+                            aria-label="Change theme" aria-haspopup="true" aria-expanded="false"
+                            aria-controls="theme-list">
                             <i class="fa fa-paint-brush"></i>
                         </button>
                         <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
@@ -160,7 +167,9 @@
                             <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
                         </ul>
                         {{#if search_enabled}}
-                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
+                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)"
+                            aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S"
+                            aria-controls="searchbar">
                             <i class="fa fa-search"></i>
                         </button>
                         {{/if}}
@@ -191,7 +200,8 @@
                 {{#if search_enabled}}
                 <div id="search-wrapper" class="hidden">
                     <form id="searchbar-outer" class="searchbar-outer">
-                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
+                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..."
+                            aria-controls="searchresults-outer" aria-describedby="searchresults-header">
                     </form>
                     <div id="searchresults-outer" class="searchresults-outer hidden">
                         <div id="searchresults-header" class="searchresults-header"></div>
@@ -205,14 +215,16 @@
                 <script>
                     document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
                     document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
-                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
+                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function (link) {
                         link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
                     });
                 </script>
 
                 <div id="content" class="content">
                     <!-- Page table of contents -->
-                    <div class="sidetoc"><nav class="pagetoc"></nav></div>
+                    <div class="sidetoc">
+                        <nav class="pagetoc"></nav>
+                    </div>
                     <main>
                         {{{ content }}}
                         <div id="giscus-container"></div>
@@ -221,15 +233,17 @@
                     <nav class="nav-wrapper" aria-label="Page navigation">
                         <!-- Mobile navigation buttons -->
                         {{#previous}}
-                            <a rel="prev" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
-                                <i class="fa fa-angle-left"></i>
-                            </a>
+                        <a rel="prev" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters previous"
+                            title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                            <i class="fa fa-angle-left"></i>
+                        </a>
                         {{/previous}}
 
                         {{#next}}
-                            <a rel="next prefetch" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
-                                <i class="fa fa-angle-right"></i>
-                            </a>
+                        <a rel="next prefetch" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters next"
+                            title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                            <i class="fa fa-angle-right"></i>
+                        </a>
                         {{/next}}
 
                         <div style="clear: both"></div>
@@ -239,15 +253,17 @@
 
             <nav class="nav-wide-wrapper" aria-label="Page navigation">
                 {{#previous}}
-                    <a rel="prev" href="{{ path_to_root }}{{link}}" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
-                        <i class="fa fa-angle-left"></i>
-                    </a>
+                <a rel="prev" href="{{ path_to_root }}{{link}}" class="nav-chapters previous" title="Previous chapter"
+                    aria-label="Previous chapter" aria-keyshortcuts="Left">
+                    <i class="fa fa-angle-left"></i>
+                </a>
                 {{/previous}}
 
                 {{#next}}
-                    <a rel="next prefetch" href="{{ path_to_root }}{{link}}" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
-                        <i class="fa fa-angle-right"></i>
-                    </a>
+                <a rel="next prefetch" href="{{ path_to_root }}{{link}}" class="nav-chapters next" title="Next chapter"
+                    aria-label="Next chapter" aria-keyshortcuts="Right">
+                    <i class="fa fa-angle-right"></i>
+                </a>
                 {{/next}}
             </nav>
 
@@ -266,7 +282,7 @@
                 }
             };
 
-            window.onbeforeunload = function() {
+            window.onbeforeunload = function () {
                 socket.close();
             }
         </script>
@@ -280,10 +296,12 @@
             // make sure we don't activate google analytics if the developer is
             // inspecting the book locally...
             if (localAddrs.indexOf(document.location.hostname) === -1) {
-                (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-                (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-                m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-                })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
+                (function (i, s, o, g, r, a, m) {
+                    i['GoogleAnalyticsObject'] = r; i[r] = i[r] || function () {
+                        (i[r].q = i[r].q || []).push(arguments)
+                    }, i[r].l = 1 * new Date(); a = s.createElement(o),
+                        m = s.getElementsByTagName(o)[0]; a.async = 1; a.src = g; m.parentNode.insertBefore(a, m)
+                })(window, document, 'script', 'https://www.google-analytics.com/analytics.js', 'ga');
 
                 ga('create', '{{google_analytics}}', 'auto');
                 ga('send', 'pageview');
@@ -322,7 +340,7 @@
         <script src="{{ path_to_root }}book.js"></script>
 
         <script type="text/javascript" charset="utf-8">
-        var pagePath = "{{ path }}"
+            var pagePath = "{{ path }}"
         </script>
 
 
@@ -334,21 +352,22 @@
         {{#if is_print}}
         {{#if mathjax_support}}
         <script>
-        window.addEventListener('load', function() {
-            MathJax.Hub.Register.StartupHook('End', function() {
-                window.setTimeout(window.print, 100);
+            window.addEventListener('load', function () {
+                MathJax.Hub.Register.StartupHook('End', function () {
+                    window.setTimeout(window.print, 100);
+                });
             });
-        });
         </script>
         {{else}}
         <script>
-        window.addEventListener('load', function() {
-            window.setTimeout(window.print, 100);
-        });
+            window.addEventListener('load', function () {
+                window.setTimeout(window.print, 100);
+            });
         </script>
         {{/if}}
         {{/if}}
 
     </div>
-    </body>
+</body>
+
 </html>