input: Write a python function to get the common elements from a list of lists.
  assert get_common_elements([[1, 2, 3], [2, 3, 4], [3, 4, 5]]) == [3]
  assert get_common_elements([[10, 20, 30], [20, 30, 40], [30, 40, 50]]) == [30]
  assert get_common_elements([[5, 6, 7], [5, 8, 9], [5, 10, 11]]) == [5]
output: def get_common_elements(list_of_lists):
      if not list_of_lists:
          return []
      common_elements = set(list_of_lists[0])
      for lst in list_of_lists[1:]:
          common_elements.intersection_update(lst)
      return list(common_elements)