code: def lcase(instr, lenout=_default_len_out):
      
      instr = stypes.stringToCharP(instr)
      lenout = ctypes.c_int(lenout)
      outstr = stypes.stringToCharP(lenout)
      libspice.lcase_c(instr, lenout, outstr)
      return stypes.toPythonString(outstr)
docs: Convert the characters in a string to lowercase.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/lcase_c.html
  
      :param instr: Input string.
      :type instr: str
      :param lenout: Maximum length of output string.
      :type lenout: int
      :return: Output string, all lowercase.
      :rtype: str