input: Write a python function to return a list of even numbers in a given range.
  assert get_even_numbers(1, 10) == [2, 4, 6, 8, 10]
  assert get_even_numbers(3, 15) == [4, 6, 8, 10, 12, 14]
  assert get_even_numbers(0, 5) == [0, 2, 4]
output: def get_even_numbers(start, end):
      return [num for num in range(start, end + 1) if num % 2 == 0]