code: def insrtc(item, inset):
      
      assert isinstance(inset, stypes.SpiceCell)
      if isinstance(item, list):
          for c in item:
              libspice.insrtc_c(stypes.stringToCharP(c), ctypes.byref(inset))
      else:
          item = stypes.stringToCharP(item)
          libspice.insrtc_c(item, ctypes.byref(inset))
docs: Insert an item into a character set.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/insrtc_c.html
  
      :param item: Item to be inserted.
      :type item: str or list of str
      :param inset: Insertion set.
      :type inset: spiceypy.utils.support_types.SpiceCell