old_contents: import click
  
  @click.group(name='pytn')
  @click.option('--input-string1', help='Optional input string.')
  @click.option('--input-string2', metavar='<string>', help='Another optional input string.')
  def cli(do_stuff, input_string1, input_string2):
      """
      Outputs messages.
      """
  
  @cli.command()
  def hello():
      """
      Says hello.
      """
      click.echo("Hello, PyTN!")
  
  
  
  
  if __name__ == '__main__':
      cli()
  
new_contents: import click
  
  @click.group(name='pytn')
  @click.option('--input-string1', help='Optional input string.')
  @click.option('--input-string2', metavar='<string>', help='Another optional input string.')
  def cli(do_stuff, input_string1, input_string2):
      """
      Outputs messages.
      """
  
  @cli.command()
  def hello():
      """
      Says hello.
      """
      click.echo("Hello, PyTN!")
  
  if __name__ == '__main__':
      cli()
  
subject: fix whitespace