code: func (document *Document) GetPartName(part int) string {
  	cPart := C.int(part)
  	cPartName := C.get_document_part_name(document.handle, cPart)
  	defer C.free(unsafe.Pointer(cPartName))
  	return C.GoString(cPartName)
  }
docs: // GetPartName returns current slide title (for presentations) or page title (for text documents)