input: Write a python function to create a matrix using a list of lists.
  assert create_matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) == [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
  assert create_matrix([[10, 20], [30, 40]]) == [[10, 20], [30, 40]]
  assert create_matrix([[1]]) == [[1]]
output: def create_matrix(lst_of_lsts):
      return lst_of_lsts