_add_common_args
=======================================

.. py:function:: petpal.cli.cli_preproc._add_common_args(parser: argparse.ArgumentParser) -> None

   Adds common arguments ('--input-img', '--out-img') to a provided ArgumentParser
   object.

   This function modifies the passed ArgumentParser object by adding two arguments commonly
   used for the command line scripts. It uses the add_argument method of the ArgumentParser class.
   After running this function, the parser will be able to accept and parse these additional
   arguments from the command line when run.

   .. note::
       This function modifies the passed `parser` object in-place and does not return anything.

   :param parser: The argument parser object to which the arguments are
                  added.
   :type parser: argparse.ArgumentParser

   :raises argparse.ArgumentError: If a duplicate argument tries to be added.

   Side Effects:
       Modifies the ArgumentParser object by adding new arguments.

   .. rubric:: Example

   .. code-block:: python

       parser = argparse.ArgumentParser()
       _add_common_args(parser)
       args = parser.parse_args(['--pet', 'pet_file', '--out-dir', './', '--prefix', 'prefix'])
       print(args.pet)
       print(args.out_dir)
       print(args.prefix)