Write an interface for Order type classes that is called IOrder. The IOrder interface can be used with multiple types of Order classes such as a food order class (which you may design for the previous problem) or some other order class for other products or services. The interface should define methods and constants that will be required for all types of order classes (you define the methods and any constants). Implement the IOrder interface with a food order class and a grocery order class. Create a test that uses the methods.