Merge branch 'master' of https://github.com/sunface/rust-by-practice

zh-CN/src/collections/String.md

@@ -113,7 +113,7 @@ fn main() {
 
 **示例**
 ```rust
-use utf_slice;
+use utf8_slice;
 fn main() {
    let s = "The 🚀 goes to the 🌑!";
 

zh-CN/src/compound-types/string.md

@@ -245,7 +245,7 @@ fn main() {
 
 **Example**
 ```rust
-use utf_slice;
+use utf8_slice;
 fn main() {
    let s = "The 🚀 goes to the 🌑!";