input: Write a python function to zip two lists together and return the result.
  assert zip_lists([1, 2, 3, 4], [5, 6, 7, 8]) == [(1, 5), (2, 6), (3, 7), (4, 8)]
  assert zip_lists([10, 20], [30, 40]) == [(10, 30), (20, 40)]
  assert zip_lists(['a', 'b', 'c'], [1, 2, 3]) == [('a', 1), ('b', 2), ('c', 3)]
output: def zip_lists(list1, list2):
      return list(zip(list1, list2))