input: Write a python function to convert a string to both an integer and a float.
  assert convert_string("12345") == (12345, 12345.0)
  assert convert_string("67890") == (67890, 67890.0)
  assert convert_string("0") == (0, 0.0)
output: def convert_string(s):
      return (int(s), float(s))