docs: def execute(tokens):
      """ Perform the actions described by the input tokens. """
      if not validate_rc():
          print('Your .vacationrc file has errors!')
          echo_vacation_rc()
          return
  
      for action, value in tokens:
          if action == 'show':
              show()
          elif action == 'log':
              log_vacation_days()
          elif action == 'echo':
              echo_vacation_rc()
          elif action == 'take':
              take(value)
          elif action == 'cancel':
              cancel(value)
          elif action == 'setrate':
              setrate(value)
          elif action == 'setdays':
              setdays(value)