// 設定訂單
 public void SetOrder(ExampleCommand command)
 {
     if (command.ToString() == "Command.BakeChickenWingCommand")
     {
         Console.WriteLine($"服務生:雞翅沒有了,請點別的");
     }
     else
     {
         orders.Add(command);
         Console.WriteLine($"增加訂單: {command.ToString()}, 時間: {DateTime.Now.ToString()}");
     }
 }
 // 取消訂單
 public void CancelOrder(ExampleCommand command)
 {
     orders.Remove(command);
     Console.WriteLine($"取消訂單: {command.ToString()}, 時間: {DateTime.Now.ToString()}");
 }