add todo tag to chapters

src/SUMMARY.md

@@ -1,74 +1,74 @@
 # Rust编程指南
 
 [为何创作本书](why-another.md)
-[关于Rust语言](into-rust.md)
+[关于Rust语言(todo)](into-rust.md)
 
 ## Getting started
 
 - [牛刀小试](first-try/intro.md)
-    - [安装Rust环境](first-try/installation.md)
+    - [安装Rust环境(todo)](first-try/installation.md)
-    - [墙推VSCode!](first-try/editor.md)
+    - [墙推VSCode!(todo)](first-try/editor.md)
-    - [认识Cargo](first-try/cargo.md)
+    - [认识Cargo(todo)](first-try/cargo.md)
-    - [你好，世界!](first-try/hello-world.md)
+    - [你好，世界!(todo)](first-try/hello-world.md)
 
 ## Rust学习三部曲
 
 - [基本概念](basic/intro.md)
     - [变量与绑定](basic/variable.md)
-    - [基本类型](basic/type.md)
+    - [基本类型(todo)](basic/type.md)
-    - [复合类型](basic/compound-type.md)
+    - [复合类型(todo)](basic/compound-type.md)
-    - [函数与方法](basic/function-method.md)
+    - [函数与方法(todo)](basic/function-method.md)
-    - [格式化输出](basic/formatted-output.md)
+    - [格式化输出(todo)](basic/formatted-output.md)
-    - [字符串、数组与切片](basic/string-array-slice.md)
+    - [字符串、数组与切片(todo)](basic/string-array-slice.md)
-    - [流程控制](basic/flow-control.md)
+    - [流程控制(todo)](basic/flow-control.md)
-    - [返回、异常和错误](basic/exception-error.md)
+    - [返回、异常和错误(todo)](basic/exception-error.md)
-    - [模式匹配](basic/match-pattern.md)
+    - [模式匹配(todo)](basic/match-pattern.md)
-    - [文档注释](basic/comment.md)
+    - [文档注释(todo)](basic/comment.md)
-    - [包和模块](basic/crate-module.md)
+    - [包和模块(todo)](basic/crate-module.md)
-    - [语句与表达式](basic/statement-expression.md)
+    - [语句与表达式(todo)](basic/statement-expression.md)
 
 - [核心概念](core/intro.md)
-    - [所有权](core/ownership.md)
+    - [所有权(todo)](core/ownership.md)
-    - [借用](core/borrowing.md)
+    - [借用(todo)](core/borrowing.md)
-    - [生命周期](core/lifetime.md)
+    - [生命周期(todo)](core/lifetime.md)
     
 - [进阶编程](advance/intro.md)
-    - [泛型](advance/generitic.md)
+    - [泛型(todo)](advance/generitic.md)
-    - [特征](advance/trait.md)
+    - [特征(todo)](advance/trait.md)
-    - [迭代器](advance/interator.md)
+    - [迭代器(todo)](advance/interator.md)
-    - [集合类型](advance/collection.md)
+    - [集合类型(todo)](advance/collection.md)
-    - [函数式编程](advance/functional-programing.md)
+    - [函数式编程(todo)](advance/functional-programing.md)
-    - [智能指针](advance/smart-pointer.md)
+    - [智能指针(todo)](advance/smart-pointer.md)
-    - [多线程](advance/threads.md)
+    - [多线程(todo)](advance/threads.md)
-    - [测试](advance/tests.md)
+    - [测试(todo)](advance/tests.md)
-    - [错误处理](advance/errors.md)
+    - [错误处理(todo)](advance/errors.md)
-    - [宏](advance/macro.md)
+    - [宏(todo)](advance/macro.md)
-    - [Bypass Borrow Checker](advance/bypass-borrow.md)
+    - [Bypass Borrow Checker(todo)](advance/bypass-borrow.md)
-    - [常用三方库列表](advance/utils.md)
+    - [常用三方库列表(todo)](advance/utils.md)
 
 ## 专题内容
 
 - [代码风格](style-guide/intro.md)
     - [命名规范](style-guide/naming.md)
 - [面向对象](object-oriented/intro.md)
-    - [OO所需的特性](object-oriented/characteristics.md)
+    - [OO所需的特性(todo)](object-oriented/characteristics.md)
 - [异步编程](async/intro.md)
-    - [并发与并行](async/concurrency-parallelism.md)
+    - [并发与并行(todo)](async/concurrency-parallelism.md)
 - [Cargo详解](cargo/intro.md)
-    - [配置参数](cargo/manifest.md)
+    - [配置参数(todo)](cargo/manifest.md)
 - [性能调优](performance/intro.md)
-    - [Benchmark性能测试](performance/benchmark.md)
+    - [Benchmark性能测试(todo)](performance/benchmark.md)
-    - [减少Runtime check](performance/runtime-check.md)
+    - [减少Runtime check(todo)](performance/runtime-check.md)
 - [Unsafe](unsafe/intro.md)
-    - [原始指针](unsafe/raw-pointer.md)
+    - [原始指针(todo)](unsafe/raw-pointer.md)
 - [宏编程](macro/intro.md)
-    - [过程宏](macro/procedure-macro.md)
+    - [过程宏(todo)](macro/procedure-macro.md)
 - [常用三方库](third-party/intro.md)
-    - [serde](third-party/serde.md)
+    - [serde(todo)](third-party/serde.md)
 
 ## 场景模版
 
-- [场景示例](use-case/intro.md)
+- [场景示例(todo)](use-case/intro.md)
 
 
 ## 附录

src/basic/variable.md

@@ -1,6 +1,6 @@
 # 变量与绑定
 
-> 本文在内容上部分参考了Rust官方编程那本书
+> 本节在内容上部分参考了[Rust Book](https://doc.rust-lang.org/stable/book/)
 
 鉴于本书的[目标读者](../intro.md)已经熟练掌握其它任意一门编程语言，因此这里就不再对何为变量进行赘述，让我们开门见山来谈谈，为何Rust选择了手动设定变量可变性。