update readme

en/src/SUMMARY.md

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+# Summary
+
+- [Why Exercise.rs](why-exercise.md)
+- [Variables todo](variables.md)
+- [Basic Types todo](basic-types/intro.md)
+  - [Numbers](basic-types/numbers.md)
+  - [Char, Bool and Unit](basic-types/char-bool-unit.md)
+  - [Statements and Expressions](basic-types/statements-expressions.md)
+  - [Functions](basic-types/functions.md)
+- [Ownership and Borrowing todo](ownership/intro.md)
+  - [Ownership](ownership/ownership.md)
+  - [Reference and Borrowing](ownership/borrowing.md)
+- [Compound Types todo](compound-types/intro.md)
+  - [string and slice](compound-types/string-slice.md)
+  - [tuple](compound-types/tuple.md)
+  - [struct](compound-types/struct.md)
+  - [enum](compound-types/enum.md)
+  - [array](compound-types/array.md)
+- [Flow Control todo](flow-control.md)
+- [Pattern Match todo](pattern-match/intro.md)
+  - [match, if let](pattern-match/match-iflet.md)
+  - [Option destructing](pattern-match/option.md)
+  - [Patterns](pattern-match/patterns.md)
+- [Method todo](method.md)
+- [Generics and Traits todo](generics-traits/intro.md)
+  - [Generics](generics-traits/generics.md)
+  - [Traits](generics-traits/traits.md)
+  - [Trait Object](generics-traits/trait-object.md)
+  - [Advance Traits](generics-traits/advance-traits.md)
+- [Collection Types todo](collections/intro.md)
+  - [Vector](collections/vector.md)
+  - [HashMap](collections/hashmap.md)
+- [Type Conversion todo](type-conversion.md)
+- [Result and panic todo](result-panic/intro.md)
+  - [panic!](result-panic/panic.md)
+  - [result and ?](result-panic/result.md)
+- [Crate and module todo](crate-module/intro.md)
+  - [Crate](crate-module/crate.md)
+  - [Module](crate-module/module.md)
+  - [use and pub](crate-module/use-pub.md)
+- [Comments and Docs todo](comments-docs.md)
+- [Formatted output todo](formatted-output.md)
+- [Lifetime todo](lifetime/intro.md)
+  - [basic](lifetime/basic.md)
+  - [&'static and T: 'static](lifetime/static.md)
+  - [advance](lifetime/advance.md)
+- [Functional programing todo](functional-programing/intro.md)
+  - [Closure](functional-programing/cloure.md)
+  - [Iterator](functional-programing/iterator.md)
+- [newtype and Sized todo](newtype-sized.md)
+- [Smart pointers todo](smart-pointers/intro.md)
+  - [Box](smart-pointers/box.md)
+  - [Deref](smart-pointers/deref.md)
+  - [Drop](smart-pointers/drop.md)
+  - [Rc and Arc](smart-pointers/rc-arc.md)
+  - [Cell and RefCell](smart-pointers/cell-refcell.md)
+- [Weak and Circle reference todo](weak.md)
+- [Self referential todo](self-referential.md)
+- [Threads todo](threads/intro.md)
+  - [Basic using](threads/basic-using.md)
+  - [Message passing](threads/message-passing.md)
+  - [Sync](threads/sync.md)
+  - [Atomic](threads/atomic.md)
+  - [Send and Sync](threads/send-sync.md)
+- [Global variables todo](global-variables.md)
+- [Errors todo](errors.md)
+- [unsafe todo](unsafe.md)
+- [macro todo](macro.md)
+- [Tests todo](tests/intro.md)
+  - [Write Tests](tests/write-tests.md)
+  - [Benchmark](tests/benchmark.md)
+  - [Unit and Integration](tests/unit-integration.md)
+  - [Assertions](tests/assertions.md)
+- [Async/Await todo](async/intro.md)
+  - [async and await!](async/async-await.md)
+  - [Future](async/future.md)
+  - [Pin and Unpin](async/pin-unpin.md)
+  - [Stream](async/stream.md)
+  

en/src/async/async-await.md

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+# async and await!

en/src/async/future.md

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+# Future

en/src/async/intro.md

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+# Async/Await

en/src/async/pin-unpin.md

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+# Pin and Unpin

en/src/async/stream.md

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+# Stream

en/src/basic-types/char-bool-unit.md

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+# Char, Bool and Unit

en/src/basic-types/functions.md

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+# Functions

en/src/basic-types/intro.md

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+# Basic Types

en/src/basic-types/numbers.md

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+# Numbers

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

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+# Statements and Expressions

en/src/circle-refer

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+# Weak and Circle reference

en/src/circle-reference/intro.md

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+# Circle reference and Self referential

en/src/collections/hashmap.md

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+# HashMap

en/src/collections/intro.md

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+# Collection Types

en/src/collections/vector.md

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+# Vector

en/src/comments-docs.md

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+# Comments and Docs

en/src/compound-types/array.md

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+# array

en/src/compound-types/enum.md

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+# enum

en/src/compound-types/intro.md

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+# Compound Types

en/src/compound-types/string-slice.md

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+# string and slice

en/src/compound-types/struct.md

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+# struct

en/src/compound-types/tuple.md

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+# tuple

en/src/crate

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+# Crate

en/src/crate-module/crate.md

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+# Crate

en/src/crate-module/intro.md

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+# Crate and module

en/src/crate-module/module.md

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+# Module

en/src/crate-module/use-pub.md

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+# use and pub

en/src/errors.md

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+# Errors

en/src/flow-control.md

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+# Flow Control

en/src/formatted-output.md

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+# Formatted output

en/src/functional-programing/cloure.md

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+# Closure
+
+下面代码是Rust圣经课程中[闭包](http://course.rs/advance/functional-programing/closure.html#结构体中的闭包)章节的课内练习题答案：
+
+```rust
+struct Cacher<T,E>
+where
+    T: Fn(E) -> E,
+    E: Copy
+{
+    query: T,
+    value: Option<E>,
+}
+
+impl<T,E> Cacher<T,E>
+where
+    T: Fn(E) -> E,
+    E: Copy
+{
+    fn new(query: T) -> Cacher<T,E> {
+        Cacher {
+            query,
+            value: None,
+        }
+    }
+
+    fn value(&mut self, arg: E) -> E {
+        match self.value {
+            Some(v) => v,
+            None => {
+                let v = (self.query)(arg);
+                self.value = Some(v);
+                v
+            }
+        }
+    }
+}
+fn main() {
+  
+}
+
+#[test]
+fn call_with_different_values() {
+    let mut c = Cacher::new(|a| a);
+
+    let v1 = c.value(1);
+    let v2 = c.value(2);
+
+    assert_eq!(v2, 1);
+}
+```

en/src/functional-programing/intro.md

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+# Functional programing

en/src/functional-programing/iterator.md

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+# Iterator

en/src/functional-programming/closure.md

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+# Closure
+
+下面代码是Rust圣经课程中[闭包](http://course.rs/advance/functional-programing/closure.html#结构体中的闭包)章节的课内练习题答案：
+
+```rust
+struct Cacher<T,E>
+where
+    T: Fn(E) -> E,
+    E: Copy
+{
+    query: T,
+    value: Option<E>,
+}
+
+impl<T,E> Cacher<T,E>
+where
+    T: Fn(E) -> E,
+    E: Copy
+{
+    fn new(query: T) -> Cacher<T,E> {
+        Cacher {
+            query,
+            value: None,
+        }
+    }
+
+    fn value(&mut self, arg: E) -> E {
+        match self.value {
+            Some(v) => v,
+            None => {
+                let v = (self.query)(arg);
+                self.value = Some(v);
+                v
+            }
+        }
+    }
+}
+fn main() {
+  
+}
+
+#[test]
+fn call_with_different_values() {
+    let mut c = Cacher::new(|a| a);
+
+    let v1 = c.value(1);
+    let v2 = c.value(2);
+
+    assert_eq!(v2, 1);
+}
+```

en/src/functional-programming/intro.md

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+# Functional Programming

en/src/generics-traits/advance-traits.md

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+# Advance Traits

en/src/generics-traits/generics.md

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+# Generics

en/src/generics-traits/intro.md

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+# Generics and Traits

en/src/generics-traits/trait-object.md

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+# Trait Object

en/src/generics-traits/traits.md

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+# Traits

en/src/global-variables.md

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+# Global variables

en/src/lifetime/advance.md

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+# advance

en/src/lifetime/basic.md

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+## 生命周期消除
+
+```rust
+fn print(s: &str);                                      // elided
+fn print<'a>(s: &'a str);                               // expanded
+
+fn debug(lvl: usize, s: &str);                          // elided
+fn debug<'a>(lvl: usize, s: &'a str);                   // expanded
+
+fn substr(s: &str, until: usize) -> &str;               // elided
+fn substr<'a>(s: &'a str, until: usize) -> &'a str;     // expanded
+
+fn get_str() -> &str;                                   // ILLEGAL
+
+fn frob(s: &str, t: &str) -> &str;                      // ILLEGAL
+
+fn get_mut(&mut self) -> &mut T;                        // elided
+fn get_mut<'a>(&'a mut self) -> &'a mut T;              // expanded
+
+fn args<T: ToCStr>(&mut self, args: &[T]) -> &mut Command                  // elided
+fn args<'a, 'b, T: ToCStr>(&'a mut self, args: &'b [T]) -> &'a mut Command // expanded
+
+fn new(buf: &mut [u8]) -> BufWriter;                    // elided
+fn new(buf: &mut [u8]) -> BufWriter<'_>;                // elided (with `rust_2018_idioms`)
+fn new<'a>(buf: &'a mut [u8]) -> BufWriter<'a>          // expanded
+```

en/src/lifetime/intro.md

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+# Lifetime

en/src/lifetime/static.md

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+# &'static and T: 'static
+
+```rust,editable
+use std::fmt::Display;
+
+fn main() {
+  let mut string = "First".to_owned();
+
+  string.push_str(string.to_uppercase().as_str());
+  print_a(&string);
+  print_b(&string);
+  print_c(&string); // Compilation error
+  print_d(&string); // Compilation error
+  print_e(&string);
+  print_f(&string);
+  print_g(&string); // Compilation error
+}
+
+fn print_a<T: Display + 'static>(t: &T) {
+  println!("{}", t);
+}
+
+fn print_b<T>(t: &T)
+where
+  T: Display + 'static,
+{
+  println!("{}", t);
+}
+
+fn print_c(t: &'static dyn Display) {
+  println!("{}", t)
+}
+
+fn print_d(t: &'static impl Display) {
+  println!("{}", t)
+}
+
+fn print_e(t: &(dyn Display + 'static)) {
+  println!("{}", t)
+}
+
+fn print_f(t: &(impl Display + 'static)) {
+  println!("{}", t)
+}
+
+fn print_g(t: &'static String) {
+  println!("{}", t);
+}
+```

en/src/macro.md

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+# macro

en/src/method.md

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+# Method

en/src/newtype-sized.md

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+# newtype and Sized

en/src/ownership/borrowing.md

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+# Reference and Borrowing

en/src/ownership/intro.md

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+# Ownership and Borrowing

en/src/ownership/ownership.md

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+# Ownership

en/src/pattern-match/intro.md

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+# Pattern Match

en/src/pattern-match/match-iflet.md

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+# match, if let

en/src/pattern-match/option.md

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+# Option destructing

en/src/pattern-match/patterns.md

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+# Patterns

en/src/resu

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+# panic!

en/src/result-panic/intro.md

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+# Result and panic

en/src/result-panic/panic.md

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+# panic!

en/src/result-panic/result.md

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+# result and ?

en/src/self-referential.md

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+# Self referential

en/src/smart-pointers/box.md

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+# Box

en/src/smart-pointers/cell-refcell.md

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+# Cell and RefCell

en/src/smart-pointers/deref.md

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+# Deref

en/src/smart-pointers/drop.md

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+# Drop

en/src/smart-pointers/intro.md

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+# Smart pointers

en/src/smart-pointers/rc-arc.md

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+# Rc and Arc

en/src/tests/assertions.md

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+# Assertions

en/src/tests/benchmark.md

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+# Benchmark
+
+https://doc.rust-lang.org/unstable-book/library-features/test.html

en/src/tests/intro.md

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+# Tests

en/src/tests/unit-integration.md

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+# Unit and Integration

en/src/tests/write-tests.md

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+# Write Tests

en/src/threads/atomic.md

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+# Atomic

en/src/threads/basic-using.md

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+# Basic using

en/src/threads/intro.md

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+# Threads

en/src/threads/message-passing.md

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+# Message passing

en/src/threads/send-sync.md

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+# Send and Sync

en/src/threads/sync.md

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+# Sync

en/src/type-conversion.md

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+# Type Conversion

en/src/unsafe.md

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+# unsafe

en/src/variables.md

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+# Variables

en/src/weak.md

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+# Weak and Circle reference

en/src/why-exercise.md

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+# Why Exercise.rs