fix(csharp): Modify method name to PascalCase, simplify new expression (#840)

* Modify method name to PascalCase(array and linked list)

* Modify method name to PascalCase(backtracking)

* Modify method name to PascalCase(computational complexity)

* Modify method name to PascalCase(divide and conquer)

* Modify method name to PascalCase(dynamic programming)

* Modify method name to PascalCase(graph)

* Modify method name to PascalCase(greedy)

* Modify method name to PascalCase(hashing)

* Modify method name to PascalCase(heap)

* Modify method name to PascalCase(searching)

* Modify method name to PascalCase(sorting)

* Modify method name to PascalCase(stack and queue)

* Modify method name to PascalCase(tree)

* local check

codes/csharp/chapter_array_and_linkedlist/array.cs

@@ -6,7 +6,7 @@ namespace hello_algo.chapter_array_and_linkedlist;
 
 public class array {
     /* 随机访问元素 */
-    public static int randomAccess(int[] nums) {
+    public static int RandomAccess(int[] nums) {
         Random random = new();
         // 在区间 [0, nums.Length) 中随机抽取一个数字
         int randomIndex = random.Next(nums.Length);
@@ -16,7 +16,7 @@ public class array {
     }
 
     /* 扩展数组长度 */
-    public static int[] extend(int[] nums, int enlarge) {
+    public static int[] Extend(int[] nums, int enlarge) {
         // 初始化一个扩展长度后的数组
         int[] res = new int[nums.Length + enlarge];
         // 将原数组中的所有元素复制到新数组
@@ -28,7 +28,7 @@ public class array {
     }
 
     /* 在数组的索引 index 处插入元素 num */
-    public static void insert(int[] nums, int num, int index) {
+    public static void Insert(int[] nums, int num, int index) {
         // 把索引 index 以及之后的所有元素向后移动一位
         for (int i = nums.Length - 1; i > index; i--) {
             nums[i] = nums[i - 1];
@@ -38,7 +38,7 @@ public class array {
     }
 
     /* 删除索引 index 处元素 */
-    public static void remove(int[] nums, int index) {
+    public static void Remove(int[] nums, int index) {
         // 把索引 index 之后的所有元素向前移动一位
         for (int i = index; i < nums.Length - 1; i++) {
             nums[i] = nums[i + 1];
@@ -46,7 +46,7 @@ public class array {
     }
 
     /* 遍历数组 */
-    public static void traverse(int[] nums) {
+    public static void Traverse(int[] nums) {
         int count = 0;
         // 通过索引遍历数组
         for (int i = 0; i < nums.Length; i++) {
@@ -59,7 +59,7 @@ public class array {
     }
 
     /* 在数组中查找指定元素 */
-    public static int find(int[] nums, int target) {
+    public static int Find(int[] nums, int target) {
         for (int i = 0; i < nums.Length; i++) {
             if (nums[i] == target)
                 return i;
@@ -68,7 +68,7 @@ public class array {
     }
 
     /* 辅助函数,数组转字符串 */
-    public static string toString(int[] nums) {
+    public static string ToString(int[] nums) {
         return string.Join(",", nums);
     }
 
@@ -77,31 +77,31 @@ public class array {
     public static void Test() {
         // 初始化数组
         int[] arr = new int[5];
-        Console.WriteLine("数组 arr = " + toString(arr));
+        Console.WriteLine("数组 arr = " + ToString(arr));
         int[] nums = { 1, 3, 2, 5, 4 };
-        Console.WriteLine("数组 nums = " + toString(nums));
+        Console.WriteLine("数组 nums = " + ToString(nums));
 
         // 随机访问
-        int randomNum = randomAccess(nums);
+        int randomNum = RandomAccess(nums);
         Console.WriteLine("在 nums 中获取随机元素 " + randomNum);
 
         // 长度扩展
-        nums = extend(nums, 3);
-        Console.WriteLine("将数组长度扩展至 8 ，得到 nums = " + toString(nums));
+        nums = Extend(nums, 3);
+        Console.WriteLine("将数组长度扩展至 8 ，得到 nums = " + ToString(nums));
 
         // 插入元素
-        insert(nums, 6, 3);
-        Console.WriteLine("在索引 3 处插入数字 6 ，得到 nums = " + toString(nums));
+        Insert(nums, 6, 3);
+        Console.WriteLine("在索引 3 处插入数字 6 ，得到 nums = " + ToString(nums));
 
         // 删除元素
-        remove(nums, 2);
-        Console.WriteLine("删除索引 2 处的元素，得到 nums = " + toString(nums));
+        Remove(nums, 2);
+        Console.WriteLine("删除索引 2 处的元素，得到 nums = " + ToString(nums));
 
         // 遍历数组
-        traverse(nums);
+        Traverse(nums);
 
         // 查找元素 
-        int index = find(nums, 3);
+        int index = Find(nums, 3);
         Console.WriteLine("在 nums 中查找元素 3 ，得到索引 = " + index);
     }
 }