substitute_message (const gchar *variable,
                    gpointer user_data)
{
  const gchar *message = user_data;
  if (g_str_equal (variable, "message"))
    return g_bytes_new (message, strlen (message));
  return NULL;
}
substitute_message (const gchar *variable,
                    gpointer user_data)
{
  const gchar *message = user_data;
  if (g_str_equal (variable, "message"))
    return g_bytes_new (message, strlen (message));
  return NULL;
}