Rename the common modules.

codes/csharp/utils/ListNode.cs

@@ -0,0 +1,44 @@
+// File: ListNode.cs
+// Created Time: 2022-12-16
+// Author: mingXta (1195669834@qq.com)
+
+namespace hello_algo.utils;
+
+/* Definition for a singly-linked list node */
+public class ListNode {
+    public int val;
+    public ListNode? next;
+
+    public ListNode(int x) {
+        val = x;
+    }
+
+    /* Generate a linked list with an array */
+    public static ListNode? ArrToLinkedList(int[] arr) {
+        ListNode dum = new ListNode(0);
+        ListNode head = dum;
+        foreach (int val in arr) {
+            head.next = new ListNode(val);
+            head = head.next;
+        }
+        return dum.next;
+    }
+
+    /* Get a list node with specific value from a linked list */
+    public static ListNode? GetListNode(ListNode? head, int val) {
+        while (head != null && head.val != val) {
+            head = head.next;
+        }
+        return head;
+    }
+
+    public override string? ToString() {
+        List<string> list = new();
+        var head = this;
+        while (head != null) {
+            list.Add(head.val.ToString());
+            head = head.next;
+        }
+        return string.Join("->", list);
+    }
+}