fix: unnecessary space

zh-CN/src/basic-types/char-bool-unit.md

@@ -2,7 +2,7 @@
 
 ### 字符
 1. 🌟
-```rust, editable
+```rust,editable
 //  修改2处 `assert_eq!` 让代码工作
 
 use std::mem::size_of_val;
@@ -18,7 +18,7 @@ fn main() {
 ```
 
 2. 🌟
-```rust, editable
+```rust,editable
 //  修改一行让代码正常打印
 fn main() {
     let c1 = "中";
@@ -32,7 +32,7 @@ fn print_char(c : char) {
 
 ### 布尔
 3. 🌟
-```rust, editable
+```rust,editable
 
 // 使成功打印
 fn main() {
@@ -46,7 +46,7 @@ fn main() {
 ```
 
 4. 🌟
-```rust, editable
+```rust,editable
 
 fn main() {
     let f = true;