chore: skip function files due to Rector bug

Author: kenjis

rector.php

@@ -145,6 +145,9 @@
             __DIR__ . '/system/View/Parser.php',
             __DIR__ . '/tests/system/Debug/ExceptionsTest.php',
             __DIR__ . '/tests/system/View/Views',
+            // Skip function files due to Rector bug
+            __DIR__ . '/system/Common.php',
+            __DIR__ . '/system/Helpers',
         ],
 
         // use mt_rand instead of random_int on purpose on non-cryptographically random