input: Write a python function to calculate the surface area and volume of a cube given its edge length.
  assert cube_info(3) == (54, 27)
  assert cube_info(4) == (96, 64)
  assert cube_info(5) == (150, 125)
output: def cube_info(edge_length):
      surface_area = 6 * (edge_length ** 2)
      volume = edge_length ** 3
      return surface_area, volume