static void Main(string[] args)
{
IDrink drink = new Coffee();
//点一杯咖啡
//Console.WriteLine($"{drink.Description}:{drink.cost()}");
drink = new Milk(drink);
//Console.WriteLine($"{drink.Description}:{drink.cost()}");
drink = new Sugar(drink);
Console.WriteLine($"{drink.Description}:{drink.cost()}");
Console.WriteLine("测试git1");
Console.ReadKey();
}