input: Write a python function to split a string by consecutive spaces.
  assert split_consec_spaces('This is a   long  string   of words.') == ['This', 'is', 'a', 'long', 'string', 'of', 'words.']
  assert split_consec_spaces('Hello   world!') == ['Hello', 'world!']
  assert split_consec_spaces('No    spaces at   the ends') == ['No', 'spaces', 'at', 'the', 'ends']
output: def split_consec_spaces(s):
      return s.split()