Completed

Box.cs

@@ -1,15 +1,8 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Reflection;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace TicTacToe
+namespace TicTacToe
 {
     public class Box
     {
-        public Action<int> Pressed;
+        public Action<int>? Pressed;
         public int Index;
         public bool BotOwned = false;
         private Button _button;
@@ -23,9 +16,9 @@ namespace TicTacToe
             _button.Text = "";
         }
 
-        private void Clicked(object sender, EventArgs e)
+        private void Clicked(object? sender, EventArgs e)
         {
-            Pressed.Invoke(Index);
+            Pressed?.Invoke(Index);
         }
 
         public void Destroy()