rename_subs
=========================================

.. py:function:: petpal.cli.cli_vat_processing.rename_subs(sub: str)

   Handle converting subject ID to BIDS structure.

   VATDYS0XX -> sub-VATDYS0XX
   PIBXX-YYY_VYrZ -> sub-PIBXXYYY_ses-VYrZ

   :returns:

             - subject part string
             - session part string