def clean(s):
  """Removes trailing whitespace on each line."""
  lines = [l.rstrip() for l in s.split('\n')]
  return '\n'.join(lines)
def clean(s):
  """Removes trailing whitespace on each line."""
  lines = [l.rstrip() for l in s.split('\n')]
  return '\n'.join(lines)
Removes trailing whitespace on each line.