code: func handleStopNotifyNewTransactions(wsc *wsClient, icmd interface{}) (interface{}, error) {
  	wsc.server.ntfnMgr.UnregisterNewMempoolTxsUpdates(wsc)
  	return nil, nil
  }
docs: // handleStopNotifyNewTransations implements the stopnotifynewtransactions
  // command extension for websocket connections.