protected function getEventSubtype(EventInterface $event)
{
$subevent = '';
if ($event instanceof CtcpEvent) {
$subevent = 'ctcp.' . strtolower($event->getCtcpCommand());
} elseif ($event instanceof UserEvent) {
$subevent = strtolower($event->getCommand());
} elseif ($event instanceof ServerEvent) {
$subevent = strtolower($event->getCode());
}
return $subevent;
}