static void Paint(Dude d)
        {
            Console.BackgroundColor = ConsoleColor.DarkGreen;
            Console.CursorLeft      = d.LastX;
            Console.CursorTop       = d.LastY;
            Console.Write(" ");

            Console.ForegroundColor = ConsoleColor.Blue;
            Console.BackgroundColor = ConsoleColor.Cyan;
            Console.CursorLeft      = d.X;
            Console.CursorTop       = d.Y;
            Console.Write("*");

            d.LastX = d.X;
            d.LastY = d.Y;
        }