Add build scripts for C# and

unify the coding style.

docs/chapter_array_and_linkedlist/linked_list.md

@@ -435,24 +435,9 @@ comments: true
 === "C#"
 
     ```csharp title="linked_list.cs"
-    // 在链表的结点 n0 之后插入结点 P
-    void Insert(ListNode n0, ListNode P)
-    {
-        ListNode n1 = n0.next;
-        n0.next = P;
-        P.next = n1;
-    }
+    [class]{linked_list}-[func]{insert}
 
-    // 删除链表的结点 n0 之后的首个结点
-    void Remove(ListNode n0)
-    {
-        if (n0.next == null)
-            return;
-        // n0 -> P -> n1
-        ListNode P = n0.next;
-        ListNode n1 = P.next;
-        n0.next = n1;
-    }
+    [class]{linked_list}-[func]{remove}
     ```
 
 === "Swift"
@@ -556,17 +541,7 @@ comments: true
 === "C#"
 
     ```csharp title="linked_list.cs"
-    // 访问链表中索引为 index 的结点
-    ListNode Access(ListNode head, int index)
-    {
-        for (int i = 0; i < index; i++)
-        {
-            if (head == null)
-                return null;
-            head = head.next;
-        }
-        return head;
-    }
+    [class]{linked_list}-[func]{access}
     ```
 
 === "Swift"
@@ -652,19 +627,7 @@ comments: true
 === "C#"
 
     ```csharp title="linked_list.cs"
-    // 在链表中查找值为 target 的首个结点
-    int Find(ListNode head, int target)
-    {
-        int index = 0;
-        while (head != null)
-        {
-            if (head.val == target)
-                return index;
-            head = head.next;
-            index++;
-        }
-        return -1;
-    }
+    [class]{linked_list}-[func]{find}
     ```
 
 === "Swift"