Bugfixes Telegram

public/telegram/lib/message_footer.php

@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+function telegramServiceFooter(): string
+{
+    return 'Ein Service des Astronomiemuseums der Sternwarte Sonneberg';
+}
+
+function appendTelegramServiceFooter(string $text): string
+{
+    $footer = telegramServiceFooter();
+    $trimmedText = trim($text);
+
+    if ($trimmedText === '') {
+        return $footer;
+    }
+
+    if (str_contains($trimmedText, $footer)) {
+        return $trimmedText;
+    }
+
+    return $trimmedText . "\n\n" . $footer;
+}