feat: refactoring of xml parsers

src/BusProNet/XmlParser/NotificationParser.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\BusProNet\XmlParser;
+
+use App\BusProNet\Model\Notification;
+use Symfony\Component\DomCrawler\Crawler;
+
+class NotificationParser extends AbstractParser
+{
+    public function parse(Crawler $result): Notification
+    {
+        $number = $this->getIntOrNullValue($result->filterXPath('//satz/nr'));
+        $text = $this->getStringOrNullValue($result->filterXPath('//satz/text'));
+
+        return new Notification($number, $text);
+    }
+}