a$)[10$ pts$]$ Define a FuelType enum with values for different fuel types such as "Gasoline", "Diesel", "Electric".

b$)[50$ pts$]$ Implement the classes below with the following instructions:

equals$()$ compares two objects based on the field values: If they match, it returns true; if not, false

toString$()$ prints out the fields of the class.

Make sure methods use$/$return a deep copy of the Engine object $($not a reference copy$)$