Problem 3 (15 points):

Write 1 final subclass, this time for the rectangle class. Write the subclass Square, which should take 1 input: the side length of the square. The square subclass should also implement methods to calculate its area and perimeter.

Finally, add Docstring for all methods inside each class (excluding constructors) and draw a UML diagram of the entire OOP system. Make sure to include arrows with superclass/subclass relationships.