input: Write a function to get the last element of a list.
  assert get_last_element(['Apple', 'Orange', 'Banana']) == 'Banana'
  assert get_last_element([1, 2, 3, 4, 5]) == 5
  assert get_last_element(['a', 'b', 'c']) == 'c'
output: def get_last_element(lst):
      return lst[-1]