code: def batch_write_input(structures, vasp_input_set=MPRelaxSet, output_dir=".",
                        make_dir_if_not_present=True, subfolder=None,
                        sanitize=False, include_cif=False, **kwargs):
      
      output_dir = Path(output_dir)
      for i, s in enumerate(structures):
          formula = re.sub(r'\s+', "", s.formula)
          if subfolder is not None:
              subdir = subfolder(s)
              d = output_dir / subdir
          else:
              d = output_dir / '{}_{}'.format(formula, i)
          if sanitize:
              s = s.copy(sanitize=True)
          v = vasp_input_set(s, **kwargs)
          v.write_input(str(d), make_dir_if_not_present=make_dir_if_not_present,
                        include_cif=include_cif)
docs: Batch write vasp input for a sequence of structures to
      output_dir, following the format output_dir/{group}/{formula}_{number}.
  
      Args:
          structures ([Structure]): Sequence of Structures.
          vasp_input_set (VaspInputSet): VaspInputSet class that creates
              vasp input files from structures. Note that a class should be
              supplied. Defaults to MPRelaxSet.
          output_dir (str): Directory to output files. Defaults to current
              directory ".".
          make_dir_if_not_present (bool): Create the directory if not present.
              Defaults to True.
          subfolder (callable): Function to create subdirectory name from
              structure. Defaults to simply "formula_count".
          sanitize (bool): Boolean indicating whether to sanitize the
              structure before writing the VASP input files. Sanitized output
              are generally easier for viewing and certain forms of analysis.
              Defaults to False.
          include_cif (bool): Whether to output a CIF as well. CIF files are
              generally better supported in visualization programs.
          \\*\\*kwargs: Additional kwargs are passed to the vasp_input_set class
              in addition to structure.