cargo fmt rust code (#1131)

* cargo fmt code

* Add empty line to seperate unrelated comments

* Fix review

* Update bubble_sort.rs

* Update merge_sort.rs

---------

Co-authored-by: Yudong Jin <krahets@163.com>

codes/rust/chapter_hashing/hash_map_chaining.rs

@@ -151,10 +151,13 @@ pub fn main() {
 
     /* 查询操作 */
     // 向哈希表中输入键 key ，得到值 value
-    println!("\n输入学号 13276,查询到姓名 {}", match map.get(13276) {
-        Some(value) => value,
-        None => "Not a valid Key"
-    });
+    println!(
+        "\n输入学号 13276,查询到姓名 {}",
+        match map.get(13276) {
+            Some(value) => value,
+            None => "Not a valid Key",
+        }
+    );
 
     /* 删除操作 */
     // 在哈希表中删除键值对 (key, value)