update readme.md

Readme.md

@@ -37,9 +37,8 @@ Another limit for rustlings is that you have to download rustlings to local mach
 ## difference to rust by example
 [Rust By Example](https://doc.rust-lang.org/stable/rust-by-example/) is an excellent online book for learning Rust，`exercise.rs` has some small advantages in :
 
-- more topics and exercises，specially for the hard part of Rust，e.g lifetime、smart pointers、threads 、async/.await etc
+- more topics and exercises，specially for the hard part of Rust，e.g string, lifetime, smart pointers, threads and async/.await etc
 - difficulty from easy to hard，it will minimize the gap between learning and using in projects
 - up-to-date, e.g features which added in Rust 1.59 also have the corresponding exercises in `practice.rs`
-- Both `course.rs` and `practice.rs` are designed according to the CS courses in college，so quliaty is the most important factor
 - real practices
 

en/src/SUMMARY.md

@@ -13,7 +13,7 @@
 - [Compound Types doing](compound-types/intro.md)
   - [string](compound-types/string.md)
   - [array](compound-types/array.md)
-  - [slice todo](compound-types/slice.md)
+  - [slice](compound-types/slice.md)
   - [tuple todo](compound-types/tuple.md)
   - [struct todo](compound-types/struct.md)
   - [enum todo](compound-types/enum.md)

en/src/why-exercise.md

@@ -39,11 +39,10 @@ Another limit for rustlings is that you have to download rustlings to local mach
 ## difference to rust by example
 [Rust By Example](https://doc.rust-lang.org/stable/rust-by-example/) is an excellent online book for learning Rust，`practice.rs` has some small advantages in :
 
-- more topics and exercises，specially for the hard part of Rust，e.g lifetime、smart pointers、threads 、async/.await etc
+- more topics and exercises，specially for the hard part of Rust，e.g string, lifetime, smart pointers, threads and async/.await etc
 - difficulty from easy to hard，it will minimize the gap between learning and using in projects
-- up-to-date, e.g features which added in Rust 1.58 also have the corresponding exercises in `practice.rs`
-- Both `course.rs` and `practice.rs` are designed according to the CS courses in college，so quliaty is the most important factor
-- real practice
+- up-to-date, e.g features which added in Rust 1.59 also have the corresponding exercises in `practice.rs`
+- real practices
 
 
 

zh-CN/src/SUMMARY.md

@@ -13,7 +13,7 @@
 - [复合类型 doing](compound-types/intro.md)
   - [字符串](compound-types/string.md)
   - [数组](compound-types/array.md)
-  - [切片 undo](compound-types/slice.md)
+  - [切片](compound-types/slice.md)
   - [元组 undo](compound-types/tuple.md)
   - [结构体 undo](compound-types/struct.md)
   - [枚举 undo](compound-types/enum.md)