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I refactored AddCommandParser, so now just need to refactor AddCommand to integrate with the parser. I have also refactored ParserUtils, ParserUtils test and added a new class Category under parser which is to determine whether an entry to be added is a revenue or an expense. Also, I moved all the parser util classes to a util package under parser package. Lastly, I deleted the addressnbook commands except Add, Delete and Help Command.
Additional Notes: While the AddCommandParser checks and create a Revenue/Expense based on category, the AddCommand should check whether the entry is of type Revenue/Expense so that it can be added to the correct list respectively.