protected function registerServices()
    {
        $services = array_filter($this->config->get('app.services'), function ($service) {
            return class_exists($service);
        });

        foreach ($services as $service) {
            /** @var \Fyuze\Kernel\Service $obj */
            $obj = new $service($this->container);
            $obj->services();

            $this->services[] = $obj;
        }
    }