diff --git a/en/.gitignore b/.gitignore
similarity index 100%
rename from en/.gitignore
rename to .gitignore
diff --git a/en/assets/CNAME b/assets/CNAME
similarity index 100%
rename from en/assets/CNAME
rename to assets/CNAME
diff --git a/en/book.toml b/book.toml
similarity index 93%
rename from en/book.toml
rename to book.toml
index f0e492b..5d2954b 100644
--- a/en/book.toml
+++ b/book.toml
@@ -12,7 +12,6 @@ editor = "ace"
 enable = true
 
 [output.html]
-additional-js = ["assets/lang.js"]
 git-repository-url = "https://github.com/sunface/rust-exercise"
 edit-url-template = "https://github.com/sunface/rust-exercise/edit/master/{path}"
 
diff --git a/en/deploy b/deploy
similarity index 87%
rename from en/deploy
rename to deploy
index b45e213..c1c7896 100755
--- a/en/deploy
+++ b/deploy
@@ -15,7 +15,7 @@ git config user.email "cto@188.com"
 git add .
 git commit -m 'deploy'
 git branch -M gh-pages
-git remote add origin https://github.com/course-rs/rust-exercise
+git remote add origin https://github.com/sunface/rust-exercise
 
 ## push to github pages
 git push -u -f origin gh-pages
\ No newline at end of file
diff --git a/en/src/SUMMARY.md b/src/SUMMARY.md
similarity index 100%
rename from en/src/SUMMARY.md
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similarity index 100%
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diff --git a/en/src/async/intro.md b/src/async/intro.md
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diff --git a/zh/.gitignore b/zh/.gitignore
deleted file mode 100644
index 7585238..0000000
--- a/zh/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-book
diff --git a/zh/assets/CNAME b/zh/assets/CNAME
deleted file mode 100644
index d893176..0000000
--- a/zh/assets/CNAME
+++ /dev/null
@@ -1 +0,0 @@
-zh.exercise.rs
\ No newline at end of file
diff --git a/zh/book.toml b/zh/book.toml
deleted file mode 100644
index f0e492b..0000000
--- a/zh/book.toml
+++ /dev/null
@@ -1,20 +0,0 @@
-[book]
-title = "Rust Exercise"
-description = "A set of exercises and examples to pratice various aspects of Rust, also for the rust course (book) at https://course.rs"
-authors = ["sunface, https://im.dev"]
-language = "en"
-
-[output.html.playpen]
-editable = true
-editor = "ace"
-
-[output.html.fold]
-enable = true
-
-[output.html]
-additional-js = ["assets/lang.js"]
-git-repository-url = "https://github.com/sunface/rust-exercise"
-edit-url-template = "https://github.com/sunface/rust-exercise/edit/master/{path}"
-
-[rust]
-edition = "2021"
\ No newline at end of file
diff --git a/zh/deploy b/zh/deploy
deleted file mode 100755
index b45e213..0000000
--- a/zh/deploy
+++ /dev/null
@@ -1,21 +0,0 @@
-## this script deploys the static website of course.rs to github pages
-
-## build static website for book
-mdbook build
-## copy CNAME info to book dir
-cp ./assets/CNAME ./book/
-cp ./assets/*.html ./book/
-cp ./assets/sitemap.xml ./book/
-
-## init git repo
-cd book
-git init
-git config user.name "sunface"
-git config user.email "cto@188.com"
-git add .
-git commit -m 'deploy'
-git branch -M gh-pages
-git remote add origin https://github.com/course-rs/rust-exercise
-
-## push to github pages
-git push -u -f origin gh-pages
\ No newline at end of file
diff --git a/zh/src/SUMMARY.md b/zh/src/SUMMARY.md
deleted file mode 100644
index 1bd5e42..0000000
--- a/zh/src/SUMMARY.md
+++ /dev/null
@@ -1,79 +0,0 @@
-# Summary
-
-- [Why Exercise.rs](why-exercise.md)
-- [Variables](variables.md)
-- [Basic Types](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](ownership/intro.md)
-  - [Ownership](ownership/ownership.md)
-  - [Reference and Borrowing](ownership/borrowing.md)
-- [Compound Types](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](flow-control.md)
-- [Pattern Match](pattern-match/intro.md)
-  - [match, if let](pattern-match/match-iflet.md)
-  - [Option destructing](pattern-match/option.md)
-  - [Patterns](pattern-match/patterns.md)
-- [Method](method.md)
-- [Generics and Traits](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](collections/intro.md)
-  - [Vector](collections/vector.md)
-  - [HashMap](collections/hashmap.md)
-- [Type Conversion](type-conversion.md)
-- [Result and panic](result-panic/intro.md)
-  - [panic!](result-panic/panic.md)
-  - [result and ?](result-panic/result.md)
-- [Crate and module](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](comments-docs.md)
-- [Formatted output](formatted-output.md)
-- [Lifetime](lifetime/intro.md)
-  - [basic](lifetime/basic.md)
-  - [&'static and T: 'static](lifetime/static.md)
-  - [advance](lifetime/advance.md)
-- [Functional programing](functional-programing/intro.md)
-  - [Closure](functional-programing/cloure.md)
-  - [Iterator](functional-programing/iterator.md)
-- [newtype and Sized](newtype-sized.md)
-- [Smart pointers](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](weak.md)
-- [Self referential](self-referential.md)
-- [Threads](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](global-variables.md)
-- [Errors](errors.md)
-- [unsafe](unsafe.md)
-- [macro](macro.md)
-- [Tests](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](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)
-  
\ No newline at end of file
diff --git a/zh/src/async/async-await.md b/zh/src/async/async-await.md
deleted file mode 100644
index a20c0b8..0000000
--- a/zh/src/async/async-await.md
+++ /dev/null
@@ -1 +0,0 @@
-# async and await!
diff --git a/zh/src/async/future.md b/zh/src/async/future.md
deleted file mode 100644
index 5f24b0e..0000000
--- a/zh/src/async/future.md
+++ /dev/null
@@ -1 +0,0 @@
-# Future
diff --git a/zh/src/async/intro.md b/zh/src/async/intro.md
deleted file mode 100644
index 70bdb9f..0000000
--- a/zh/src/async/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Async/Await
diff --git a/zh/src/async/pin-unpin.md b/zh/src/async/pin-unpin.md
deleted file mode 100644
index 8655bd1..0000000
--- a/zh/src/async/pin-unpin.md
+++ /dev/null
@@ -1 +0,0 @@
-# Pin and Unpin
diff --git a/zh/src/async/stream.md b/zh/src/async/stream.md
deleted file mode 100644
index 867bd88..0000000
--- a/zh/src/async/stream.md
+++ /dev/null
@@ -1 +0,0 @@
-# Stream
diff --git a/zh/src/basic-types/char-bool-unit.md b/zh/src/basic-types/char-bool-unit.md
deleted file mode 100644
index b406dee..0000000
--- a/zh/src/basic-types/char-bool-unit.md
+++ /dev/null
@@ -1 +0,0 @@
-# Char, Bool and Unit
diff --git a/zh/src/basic-types/functions.md b/zh/src/basic-types/functions.md
deleted file mode 100644
index 0c5faf5..0000000
--- a/zh/src/basic-types/functions.md
+++ /dev/null
@@ -1 +0,0 @@
-# Functions
diff --git a/zh/src/basic-types/intro.md b/zh/src/basic-types/intro.md
deleted file mode 100644
index 2d47759..0000000
--- a/zh/src/basic-types/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Basic Types
diff --git a/zh/src/basic-types/numbers.md b/zh/src/basic-types/numbers.md
deleted file mode 100644
index bbdcf5e..0000000
--- a/zh/src/basic-types/numbers.md
+++ /dev/null
@@ -1 +0,0 @@
-# Numbers
diff --git a/zh/src/basic-types/statements-expressions.md b/zh/src/basic-types/statements-expressions.md
deleted file mode 100644
index d1f2555..0000000
--- a/zh/src/basic-types/statements-expressions.md
+++ /dev/null
@@ -1 +0,0 @@
-# Statements and Expressions
diff --git a/zh/src/circle-refer b/zh/src/circle-refer
deleted file mode 100644
index 04b7a8f..0000000
--- a/zh/src/circle-refer
+++ /dev/null
@@ -1 +0,0 @@
-# Weak and Circle reference
diff --git a/zh/src/circle-reference/intro.md b/zh/src/circle-reference/intro.md
deleted file mode 100644
index 4f99ca5..0000000
--- a/zh/src/circle-reference/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Circle reference and Self referential
diff --git a/zh/src/collections/hashmap.md b/zh/src/collections/hashmap.md
deleted file mode 100644
index 96e549d..0000000
--- a/zh/src/collections/hashmap.md
+++ /dev/null
@@ -1 +0,0 @@
-# HashMap
diff --git a/zh/src/collections/intro.md b/zh/src/collections/intro.md
deleted file mode 100644
index 1bdd607..0000000
--- a/zh/src/collections/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Collection Types
diff --git a/zh/src/collections/vector.md b/zh/src/collections/vector.md
deleted file mode 100644
index a2303c1..0000000
--- a/zh/src/collections/vector.md
+++ /dev/null
@@ -1 +0,0 @@
-# Vector
diff --git a/zh/src/comments-docs.md b/zh/src/comments-docs.md
deleted file mode 100644
index cb7d70d..0000000
--- a/zh/src/comments-docs.md
+++ /dev/null
@@ -1 +0,0 @@
-# Comments and Docs
diff --git a/zh/src/compound-types/array.md b/zh/src/compound-types/array.md
deleted file mode 100644
index 92c587c..0000000
--- a/zh/src/compound-types/array.md
+++ /dev/null
@@ -1 +0,0 @@
-# array
diff --git a/zh/src/compound-types/enum.md b/zh/src/compound-types/enum.md
deleted file mode 100644
index 298e31d..0000000
--- a/zh/src/compound-types/enum.md
+++ /dev/null
@@ -1 +0,0 @@
-# enum
diff --git a/zh/src/compound-types/intro.md b/zh/src/compound-types/intro.md
deleted file mode 100644
index 0c35451..0000000
--- a/zh/src/compound-types/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Compound Types
diff --git a/zh/src/compound-types/string-slice.md b/zh/src/compound-types/string-slice.md
deleted file mode 100644
index 9f17363..0000000
--- a/zh/src/compound-types/string-slice.md
+++ /dev/null
@@ -1 +0,0 @@
-# string and slice
diff --git a/zh/src/compound-types/struct.md b/zh/src/compound-types/struct.md
deleted file mode 100644
index 4b9489b..0000000
--- a/zh/src/compound-types/struct.md
+++ /dev/null
@@ -1 +0,0 @@
-# struct
diff --git a/zh/src/compound-types/tuple.md b/zh/src/compound-types/tuple.md
deleted file mode 100644
index ebbc1a7..0000000
--- a/zh/src/compound-types/tuple.md
+++ /dev/null
@@ -1 +0,0 @@
-# tuple
diff --git a/zh/src/crate b/zh/src/crate
deleted file mode 100644
index e66fb06..0000000
--- a/zh/src/crate
+++ /dev/null
@@ -1 +0,0 @@
-# Crate
diff --git a/zh/src/crate-module/crate.md b/zh/src/crate-module/crate.md
deleted file mode 100644
index e66fb06..0000000
--- a/zh/src/crate-module/crate.md
+++ /dev/null
@@ -1 +0,0 @@
-# Crate
diff --git a/zh/src/crate-module/intro.md b/zh/src/crate-module/intro.md
deleted file mode 100644
index dadbf20..0000000
--- a/zh/src/crate-module/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Crate and module
diff --git a/zh/src/crate-module/module.md b/zh/src/crate-module/module.md
deleted file mode 100644
index b785ceb..0000000
--- a/zh/src/crate-module/module.md
+++ /dev/null
@@ -1 +0,0 @@
-# Module
diff --git a/zh/src/crate-module/use-pub.md b/zh/src/crate-module/use-pub.md
deleted file mode 100644
index 60c6894..0000000
--- a/zh/src/crate-module/use-pub.md
+++ /dev/null
@@ -1 +0,0 @@
-# use and pub
diff --git a/zh/src/errors.md b/zh/src/errors.md
deleted file mode 100644
index 165d08c..0000000
--- a/zh/src/errors.md
+++ /dev/null
@@ -1 +0,0 @@
-# Errors
diff --git a/zh/src/flow-control.md b/zh/src/flow-control.md
deleted file mode 100644
index cf0c99f..0000000
--- a/zh/src/flow-control.md
+++ /dev/null
@@ -1 +0,0 @@
-# Flow Control
diff --git a/zh/src/formatted-output.md b/zh/src/formatted-output.md
deleted file mode 100644
index 5cd8a3b..0000000
--- a/zh/src/formatted-output.md
+++ /dev/null
@@ -1 +0,0 @@
-# Formatted output
diff --git a/zh/src/functional-programing/cloure.md b/zh/src/functional-programing/cloure.md
deleted file mode 100644
index fb73740..0000000
--- a/zh/src/functional-programing/cloure.md
+++ /dev/null
@@ -1,51 +0,0 @@
-# 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);
-}
-```
\ No newline at end of file
diff --git a/zh/src/functional-programing/intro.md b/zh/src/functional-programing/intro.md
deleted file mode 100644
index 6f326b8..0000000
--- a/zh/src/functional-programing/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Functional programing
diff --git a/zh/src/functional-programing/iterator.md b/zh/src/functional-programing/iterator.md
deleted file mode 100644
index 2a4a2aa..0000000
--- a/zh/src/functional-programing/iterator.md
+++ /dev/null
@@ -1 +0,0 @@
-# Iterator
diff --git a/zh/src/functional-programming/closure.md b/zh/src/functional-programming/closure.md
deleted file mode 100644
index fb73740..0000000
--- a/zh/src/functional-programming/closure.md
+++ /dev/null
@@ -1,51 +0,0 @@
-# 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);
-}
-```
\ No newline at end of file
diff --git a/zh/src/functional-programming/intro.md b/zh/src/functional-programming/intro.md
deleted file mode 100644
index dca041e..0000000
--- a/zh/src/functional-programming/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Functional Programming
diff --git a/zh/src/generics-traits/advance-traits.md b/zh/src/generics-traits/advance-traits.md
deleted file mode 100644
index 8cd2f63..0000000
--- a/zh/src/generics-traits/advance-traits.md
+++ /dev/null
@@ -1 +0,0 @@
-# Advance Traits
diff --git a/zh/src/generics-traits/generics.md b/zh/src/generics-traits/generics.md
deleted file mode 100644
index 292d26b..0000000
--- a/zh/src/generics-traits/generics.md
+++ /dev/null
@@ -1 +0,0 @@
-# Generics
diff --git a/zh/src/generics-traits/intro.md b/zh/src/generics-traits/intro.md
deleted file mode 100644
index 340ad0e..0000000
--- a/zh/src/generics-traits/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Generics and Traits
diff --git a/zh/src/generics-traits/trait-object.md b/zh/src/generics-traits/trait-object.md
deleted file mode 100644
index 38a0b34..0000000
--- a/zh/src/generics-traits/trait-object.md
+++ /dev/null
@@ -1 +0,0 @@
-# Trait Object
diff --git a/zh/src/generics-traits/traits.md b/zh/src/generics-traits/traits.md
deleted file mode 100644
index 445d444..0000000
--- a/zh/src/generics-traits/traits.md
+++ /dev/null
@@ -1 +0,0 @@
-# Traits
diff --git a/zh/src/global-variables.md b/zh/src/global-variables.md
deleted file mode 100644
index ad85421..0000000
--- a/zh/src/global-variables.md
+++ /dev/null
@@ -1 +0,0 @@
-# Global variables
diff --git a/zh/src/lifetime/advance.md b/zh/src/lifetime/advance.md
deleted file mode 100644
index 4ee0e07..0000000
--- a/zh/src/lifetime/advance.md
+++ /dev/null
@@ -1 +0,0 @@
-# advance
diff --git a/zh/src/lifetime/basic.md b/zh/src/lifetime/basic.md
deleted file mode 100644
index 40439f4..0000000
--- a/zh/src/lifetime/basic.md
+++ /dev/null
@@ -1,26 +0,0 @@
-## 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
-```
\ No newline at end of file
diff --git a/zh/src/lifetime/intro.md b/zh/src/lifetime/intro.md
deleted file mode 100644
index 2615315..0000000
--- a/zh/src/lifetime/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Lifetime
diff --git a/zh/src/lifetime/static.md b/zh/src/lifetime/static.md
deleted file mode 100644
index 782446e..0000000
--- a/zh/src/lifetime/static.md
+++ /dev/null
@@ -1,49 +0,0 @@
-# &'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);
-}
-```
\ No newline at end of file
diff --git a/zh/src/macro.md b/zh/src/macro.md
deleted file mode 100644
index 20503ba..0000000
--- a/zh/src/macro.md
+++ /dev/null
@@ -1 +0,0 @@
-# macro
diff --git a/zh/src/method.md b/zh/src/method.md
deleted file mode 100644
index 81d5a1c..0000000
--- a/zh/src/method.md
+++ /dev/null
@@ -1 +0,0 @@
-# Method
diff --git a/zh/src/newtype-sized.md b/zh/src/newtype-sized.md
deleted file mode 100644
index fc3f074..0000000
--- a/zh/src/newtype-sized.md
+++ /dev/null
@@ -1 +0,0 @@
-# newtype and Sized
diff --git a/zh/src/ownership/borrowing.md b/zh/src/ownership/borrowing.md
deleted file mode 100644
index 9ce0535..0000000
--- a/zh/src/ownership/borrowing.md
+++ /dev/null
@@ -1 +0,0 @@
-# Reference and Borrowing
diff --git a/zh/src/ownership/intro.md b/zh/src/ownership/intro.md
deleted file mode 100644
index e749a67..0000000
--- a/zh/src/ownership/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Ownership and Borrowing
diff --git a/zh/src/ownership/ownership.md b/zh/src/ownership/ownership.md
deleted file mode 100644
index 77f5a52..0000000
--- a/zh/src/ownership/ownership.md
+++ /dev/null
@@ -1 +0,0 @@
-# Ownership
diff --git a/zh/src/pattern-match/intro.md b/zh/src/pattern-match/intro.md
deleted file mode 100644
index ee4bb18..0000000
--- a/zh/src/pattern-match/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Pattern Match
diff --git a/zh/src/pattern-match/match-iflet.md b/zh/src/pattern-match/match-iflet.md
deleted file mode 100644
index 18eed0e..0000000
--- a/zh/src/pattern-match/match-iflet.md
+++ /dev/null
@@ -1 +0,0 @@
-# match, if let
diff --git a/zh/src/pattern-match/option.md b/zh/src/pattern-match/option.md
deleted file mode 100644
index cb5ffa1..0000000
--- a/zh/src/pattern-match/option.md
+++ /dev/null
@@ -1 +0,0 @@
-# Option destructing
diff --git a/zh/src/pattern-match/patterns.md b/zh/src/pattern-match/patterns.md
deleted file mode 100644
index 3c9daa3..0000000
--- a/zh/src/pattern-match/patterns.md
+++ /dev/null
@@ -1 +0,0 @@
-# Patterns
diff --git a/zh/src/resu b/zh/src/resu
deleted file mode 100644
index b82dd9a..0000000
--- a/zh/src/resu
+++ /dev/null
@@ -1 +0,0 @@
-# panic!
diff --git a/zh/src/result-panic/intro.md b/zh/src/result-panic/intro.md
deleted file mode 100644
index f724a70..0000000
--- a/zh/src/result-panic/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Result and panic
diff --git a/zh/src/result-panic/panic.md b/zh/src/result-panic/panic.md
deleted file mode 100644
index b82dd9a..0000000
--- a/zh/src/result-panic/panic.md
+++ /dev/null
@@ -1 +0,0 @@
-# panic!
diff --git a/zh/src/result-panic/result.md b/zh/src/result-panic/result.md
deleted file mode 100644
index 7af6baf..0000000
--- a/zh/src/result-panic/result.md
+++ /dev/null
@@ -1 +0,0 @@
-# result and ?
diff --git a/zh/src/self-referential.md b/zh/src/self-referential.md
deleted file mode 100644
index 37a4784..0000000
--- a/zh/src/self-referential.md
+++ /dev/null
@@ -1 +0,0 @@
-# Self referential
diff --git a/zh/src/smart-pointers/box.md b/zh/src/smart-pointers/box.md
deleted file mode 100644
index 2436f01..0000000
--- a/zh/src/smart-pointers/box.md
+++ /dev/null
@@ -1 +0,0 @@
-# Box
diff --git a/zh/src/smart-pointers/cell-refcell.md b/zh/src/smart-pointers/cell-refcell.md
deleted file mode 100644
index 4e61a02..0000000
--- a/zh/src/smart-pointers/cell-refcell.md
+++ /dev/null
@@ -1 +0,0 @@
-# Cell and RefCell
diff --git a/zh/src/smart-pointers/deref.md b/zh/src/smart-pointers/deref.md
deleted file mode 100644
index 8c709e8..0000000
--- a/zh/src/smart-pointers/deref.md
+++ /dev/null
@@ -1 +0,0 @@
-# Deref
diff --git a/zh/src/smart-pointers/drop.md b/zh/src/smart-pointers/drop.md
deleted file mode 100644
index c6ecf82..0000000
--- a/zh/src/smart-pointers/drop.md
+++ /dev/null
@@ -1 +0,0 @@
-# Drop
diff --git a/zh/src/smart-pointers/intro.md b/zh/src/smart-pointers/intro.md
deleted file mode 100644
index 997d50c..0000000
--- a/zh/src/smart-pointers/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Smart pointers
diff --git a/zh/src/smart-pointers/rc-arc.md b/zh/src/smart-pointers/rc-arc.md
deleted file mode 100644
index 8f723ed..0000000
--- a/zh/src/smart-pointers/rc-arc.md
+++ /dev/null
@@ -1 +0,0 @@
-# Rc and Arc
diff --git a/zh/src/tests/assertions.md b/zh/src/tests/assertions.md
deleted file mode 100644
index f5743ab..0000000
--- a/zh/src/tests/assertions.md
+++ /dev/null
@@ -1 +0,0 @@
-# Assertions
diff --git a/zh/src/tests/benchmark.md b/zh/src/tests/benchmark.md
deleted file mode 100644
index f883201..0000000
--- a/zh/src/tests/benchmark.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Benchmark
-
-https://doc.rust-lang.org/unstable-book/library-features/test.html
\ No newline at end of file
diff --git a/zh/src/tests/intro.md b/zh/src/tests/intro.md
deleted file mode 100644
index 007eb95..0000000
--- a/zh/src/tests/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Tests
diff --git a/zh/src/tests/unit-integration.md b/zh/src/tests/unit-integration.md
deleted file mode 100644
index 68df7e4..0000000
--- a/zh/src/tests/unit-integration.md
+++ /dev/null
@@ -1 +0,0 @@
-# Unit and Integration
diff --git a/zh/src/tests/write-tests.md b/zh/src/tests/write-tests.md
deleted file mode 100644
index 245c701..0000000
--- a/zh/src/tests/write-tests.md
+++ /dev/null
@@ -1 +0,0 @@
-# Write Tests
diff --git a/zh/src/threads/atomic.md b/zh/src/threads/atomic.md
deleted file mode 100644
index eecfaa8..0000000
--- a/zh/src/threads/atomic.md
+++ /dev/null
@@ -1 +0,0 @@
-# Atomic
diff --git a/zh/src/threads/basic-using.md b/zh/src/threads/basic-using.md
deleted file mode 100644
index f0a2d46..0000000
--- a/zh/src/threads/basic-using.md
+++ /dev/null
@@ -1 +0,0 @@
-# Basic using
diff --git a/zh/src/threads/intro.md b/zh/src/threads/intro.md
deleted file mode 100644
index f60f399..0000000
--- a/zh/src/threads/intro.md
+++ /dev/null
@@ -1 +0,0 @@
-# Threads
diff --git a/zh/src/threads/message-passing.md b/zh/src/threads/message-passing.md
deleted file mode 100644
index 4d33941..0000000
--- a/zh/src/threads/message-passing.md
+++ /dev/null
@@ -1 +0,0 @@
-# Message passing
diff --git a/zh/src/threads/send-sync.md b/zh/src/threads/send-sync.md
deleted file mode 100644
index 171f95f..0000000
--- a/zh/src/threads/send-sync.md
+++ /dev/null
@@ -1 +0,0 @@
-# Send and Sync
diff --git a/zh/src/threads/sync.md b/zh/src/threads/sync.md
deleted file mode 100644
index bc4491e..0000000
--- a/zh/src/threads/sync.md
+++ /dev/null
@@ -1 +0,0 @@
-# Sync
diff --git a/zh/src/type-conversion.md b/zh/src/type-conversion.md
deleted file mode 100644
index 7b930e5..0000000
--- a/zh/src/type-conversion.md
+++ /dev/null
@@ -1 +0,0 @@
-# Type Conversion
diff --git a/zh/src/unsafe.md b/zh/src/unsafe.md
deleted file mode 100644
index df49df6..0000000
--- a/zh/src/unsafe.md
+++ /dev/null
@@ -1 +0,0 @@
-# unsafe
diff --git a/zh/src/variables.md b/zh/src/variables.md
deleted file mode 100644
index ee1fba4..0000000
--- a/zh/src/variables.md
+++ /dev/null
@@ -1 +0,0 @@
-# Variables
diff --git a/zh/src/weak.md b/zh/src/weak.md
deleted file mode 100644
index 04b7a8f..0000000
--- a/zh/src/weak.md
+++ /dev/null
@@ -1 +0,0 @@
-# Weak and Circle reference
diff --git a/zh/src/why-exercise.md b/zh/src/why-exercise.md
deleted file mode 100644
index c3e5e3f..0000000
--- a/zh/src/why-exercise.md
+++ /dev/null
@@ -1 +0,0 @@
-# Why Exercise.rs