input: Write a python function to convert a string to a list of numbers where each number represents the ASCII value of the corresponding character in the string.
  assert string_to_num_list("abc") == [97, 98, 99]
  assert string_to_num_list("hello") == [104, 101, 108, 108, 111]
  assert string_to_num_list("123") == [49, 50, 51]
output: def string_to_num_list(s):
      return [ord(char) for char in s]