code: def get_current_hgnc_id(hgnc_name):
      
      hgnc_id = get_hgnc_id(hgnc_name)
      if hgnc_id:
          return hgnc_id
      hgnc_id = prev_sym_map.get(hgnc_name)
      return hgnc_id
docs: Return the HGNC ID(s) corresponding to a current or outdate HGNC symbol.
  
      Parameters
      ----------
      hgnc_name : str
          The HGNC symbol to be converted, possibly an outdated symbol.
  
      Returns
      -------
      str or list of str or None
          If there is a single HGNC ID corresponding to the given current or
          outdated HGNC symbol, that ID is returned as a string. If the symbol
          is outdated and maps to multiple current IDs, a list of these
          IDs is returned. If the given name doesn't correspond to either
          a current or an outdated HGNC symbol, None is returned.