Reformat the C# codes.

Disable creating new line before open brace.

codes/csharp/chapter_stack_and_queue/array_stack.cs

@@ -9,36 +9,30 @@ using NUnit.Framework;
 namespace hello_algo.chapter_stack_and_queue;
 
 /* 基于数组实现的栈 */
-class ArrayStack
-{
+class ArrayStack {
     private List<int> stack;
-    public ArrayStack()
-    {
+    public ArrayStack() {
         // 初始化列表（动态数组）
         stack = new();
     }
 
     /* 获取栈的长度 */
-    public int size()
-    {
+    public int size() {
         return stack.Count();
     }
 
     /* 判断栈是否为空 */
-    public bool isEmpty()
-    {
+    public bool isEmpty() {
         return size() == 0;
     }
 
     /* 入栈 */
-    public void push(int num)
-    {
+    public void push(int num) {
         stack.Add(num);
     }
 
     /* 出栈 */
-    public int pop()
-    {
+    public int pop() {
         if (isEmpty())
             throw new Exception();
         var val = peek();
@@ -47,25 +41,21 @@ class ArrayStack
     }
 
     /* 访问栈顶元素 */
-    public int peek()
-    {
+    public int peek() {
         if (isEmpty())
             throw new Exception();
         return stack[size() - 1];
     }
 
     /* 将 List 转化为 Array 并返回 */
-    public int[] toArray()
-    {
+    public int[] toArray() {
         return stack.ToArray();
     }
 }
 
-public class array_stack
-{
+public class array_stack {
     [Test]
-    public void Test()
-    {
+    public void Test() {
         /* 初始化栈 */
         ArrayStack stack = new ArrayStack();