input: def generate_number_string(m: int) -> str:
      """Produce a space-separated string of numbers ranging from 0 to m inclusive.
      >>> generate_number_string(0)
      '0'
      >>> generate_number_string(5)
      '0 1 2 3 4 5'
      """
output:     return ' '.join(str(i) for i in range(m + 1))