Create Seller and Buyer classes with add commands and test cases #60
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Currently, there are no specific classes for representing sellers and buyers in the address book application.
To differentiate between sellers and buyers in the address book application and to allow for specific functionalities and attributes for each.
Two new classes, Seller and Buyer, are created as subclasses of the Person class. Each class has its own add command and test cases to ensure proper functionality.
Subclassing from the Person class allows for code reuse and maintains consistency in the application's design.
Separate classes enable distinct behavior and attributes for sellers and buyers.
The new classes adhere to the existing design patterns and principles in the address book application. Tests cover various scenarios to ensure the correctness of the implementations.