doc: fmt code example

README.md

@@ -219,6 +219,7 @@ import queue "github.com/duke-git/lancet/v2/datastructure/queue"
 import set "github.com/duke-git/lancet/v2/datastructure/set"
 import tree "github.com/duke-git/lancet/v2/datastructure/tree"
 import heap "github.com/duke-git/lancet/v2/datastructure/heap"
+import hashmap "github.com/duke-git/lancet/v2/datastructure/hashmap"
 ```
 #### Function list:
 - [List](https://github.com/duke-git/lancet/blob/main/docs/datastructure/list.md)
@@ -228,6 +229,7 @@ import heap "github.com/duke-git/lancet/v2/datastructure/heap"
 - [Set](https://github.com/duke-git/lancet/blob/main/docs/datastructure/set.md)
 - [Tree](https://github.com/duke-git/lancet/blob/main/docs/datastructure/tree.md)
 - [Heap](https://github.com/duke-git/lancet/blob/main/docs/datastructure/heap.md)
+- [HashMap](https://github.com/duke-git/lancet/blob/main/docs/datastructure/hashmap.md)
 
 
 ### 7. Fileutil package implements some basic functions for file operations.

README_zh-CN.md

@@ -216,6 +216,7 @@ import queue "github.com/duke-git/lancet/v2/datastructure/queue"
 import set "github.com/duke-git/lancet/v2/datastructure/set"
 import tree "github.com/duke-git/lancet/v2/datastructure/tree"
 import heap "github.com/duke-git/lancet/v2/datastructure/heap"
+import hashmap "github.com/duke-git/lancet/v2/datastructure/hashmap"
 ```
 #### Function list:
 - [List](https://github.com/duke-git/lancet/blob/main/docs/datastructure/list_zh-CN.md)
@@ -225,6 +226,7 @@ import heap "github.com/duke-git/lancet/v2/datastructure/heap"
 - [Set](https://github.com/duke-git/lancet/blob/main/docs/datastructure/set_zh-CN.md)
 - [Tree](https://github.com/duke-git/lancet/blob/main/docs/datastructure/tree_zh-CN.md)
 - [Heap](https://github.com/duke-git/lancet/blob/main/docs/datastructure/heap.md)
+- [HashMap](https://github.com/duke-git/lancet/blob/main/docs/datastructure/hashmap.md)
 
 
 ### 7. fileutil包支持文件基本操作。

docs/datastructure/hashmap.md

@@ -20,6 +20,7 @@ import (
 
 <div STYLE="page-break-after: always;"></div>
 
+
 ## Index
 
 - [NewHashMap](#NewHashMap)

docs/datastructure/hashmap_zh-CN.md

@@ -22,17 +22,13 @@ import (
 
 ## 目录
 
-- [HashMap](#hashmap)
+- [NewHashMap](#NewHashMap)
-  - [源码](#源码)
+- [NewHashMapWithCapacity](#NewHashMapWithCapacity)
-  - [用法](#用法)
+
-  - [目录](#目录)
+- [Get](#Get)
-  - [API 文档](#api-文档)
+- [Put](#Put)
-    - [<span id="NewHashMap">NewHashMap</span>](#newhashmap)
+- [Delete](#Delete)
-    - [<span id="NewHashMapWithCapacity">NewHashMapWithCapacity</span>](#newhashmapwithcapacity)
+- [Contains](#Contains)
-    - [<span id="Get">Get</span>](#get)
-    - [<span id="Put">Put</span>](#put)
-    - [<span id="Delete">Delete</span>](#delete)
-    - [<span id="Contains">Contains</span>](#contains)
 
 <div STYLE="page-break-after: always;"></div>