public class Burger implements MainCourse {

    private boolean isEarlyBird;
    private Drink drink;
    private int basePrice;

    // assume that here are various constructors and methods
    // which YOU DO NOT HAVE TO WRITE: you should concern yourself
    // only with methods shown in the sequence diagram.
    
    // Now add methods to make this Burger implementation consistent
    // with the sequence diagram. You may add comments on anything
    // that is unclear to you, but you need not comment that you can't
    // tell what behaviour may be required beyond what's in the
    // sequence diagram: I know that!  Keep it simple: you are not
    // required to invent. 
    
    // ADD CODE HERE:



}