Basic implementation event signup
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		@@ -24,17 +24,18 @@ class Calendar
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    }
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    public static function printCalendar($content) {
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    public static function printCalendar($content) : string {
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        // Der zu ersetzende String
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        $original_string = '{{calendar}}';
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        $calendar = new Calendar();
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		if (str_contains($content,$original_string)) {
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			$calendar = new Calendar();
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        // Der Ersatzstring
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        $replacement_string = $calendar->show();
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        // Ersetze den Originalstring durch den Ersatzstring im Seiteninhalt
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        $content = str_replace($original_string, $replacement_string, $content);
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			// Der Ersatzstring
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			$replacement_string = $calendar->show();
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			// Ersetze den Originalstring durch den Ersatzstring im Seiteninhalt
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			$content = str_replace( $original_string, $replacement_string, $content );
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		}
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        return $content;
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    }
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