code: def get_string(cfunc, *args):
      
      cstr = get_ctype("const char**", cfunc, *args)
      return backend.ffi.string(cstr).decode() if cstr else None
docs: Call a C function and return its return value as a Python string.
  
      :param cfunc:   C function to call
      :param args:    Arguments to call function with
      :rtype:         str