private function injectRouteParamterIntoServicesFile($city): void {
        $servicesYmlPath = '/home/osboxes/PhpstormProjects/symfony/testaufgabe/app/config/services.yml';
        $servicesArrayRepr = Yaml::parseFile($servicesYmlPath);
        $servicesArrayRepr['parameters']['city'] = $city;
        $ymlRepr = Yaml::dump($servicesArrayRepr,2);
        file_put_contents($servicesYmlPath, $ymlRepr);
    }