Problem 1 – Remove Odds or Evens (Textbook-problem 17, chapter 8, page 417)

    a) Write a function that takes a list of integers as an argument, removes even numbers from the list, and returns the modified list.
    b) Write a function that takes a list of integers as an argument, removes odd numbers from the list, and returns the modified list.
    c) Write a function that takes a list of integers and a Boolean as arguments. If the Boolean is True, the function removes odd numbers from the list; otherwise, evens are removed. The function returns the modified list.