input: Write a python function to pad each line of a given string with spaces on both sides.
  assert pad_lines("Hello\nWorld") == "          Hello          \n          World          "
  assert pad_lines("Python\nCode") == "          Python          \n          Code          "
  assert pad_lines("Line1\nLine2\nLine3") == "          Line1          \n          Line2          \n          Line3          "
output: def pad_lines(input_string):
      lines = input_string.split('\n')
      padded_lines = ["          " + line + "          " for line in lines]
      return '\n'.join(padded_lines)