input: Write a function to create a new tuple adding the elements from the old tuple and the new elements.
  assert add_elements((1, 2, 3), (4, 5)) == (1, 2, 3, 4, 5)
  assert add_elements(('a', 'b'), ('c', 'd')) == ('a', 'b', 'c', 'd')
  assert add_elements((True, False), (False, True)) == (True, False, False, True)
output: def add_elements(old_tuple, new_elements):
      return old_tuple + new_elements