public Topping(AbstractCoffee c) : base(c) { }
public Sugar(AbstractCoffee c) : base(c) { }
public Milk(AbstractCoffee c) : base(c) { }
public AbstractCoffee(AbstractCoffee k) { this.k = k; }
public Topping(AbstractCoffee c) : base(c) { }
public Sugar(AbstractCoffee c) : base(c) { }
public Milk(AbstractCoffee c) : base(c) { }
public AbstractCoffee(AbstractCoffee k) { this.k = k; }