Help me with header and footer

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<?php
namespace Opencart\Catalog\Controller\Extension\Demo\Startup;

class Demo extends \Opencart\System\Engine\Controller
{
    public function index(): void
    {
        if ($this->config->get('theme_demo_status')) {
            $this->event->register('view/*/before', new \Opencart\System\Engine\Action('extension/demo/startup/demo|event'));
        }
    }

    public function event(string &$route, array &$args, mixed &$output): void
    {
        $override = [
            'common/header',
            'common/footer',
        ];

        if (in_array($route, $override)) {
            $route = 'extension/demo/' . $route;
        }
    }
}

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<?php
namespace Opencart\Catalog\Controller\Extension\Demo\Common;
class Header extends \Opencart\System\Engine\Controller {
	public function index(): string {
		$this->load->language('extension/demo/common/header');

		$data['demoheader'] = $this->url->link('demoheader/demoheader', 'language=' . $this->config->get('config_language'));
		return $this->load->view('extension/demo/common/header', $data);
	}
}

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<a href="{{ demoheader }}">Demo Header</a>

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<?php
namespace Opencart\Catalog\Controller\Extension\Demo\Common;
class Footer extends \Opencart\System\Engine\Controller {
	public function index(): string {
		$this->load->language('extension/demo/common/footer');

		$data['demofooter'] = $this->url->link('demofooter/demofooter', 'language=' . $this->config->get('config_language'));
		return $this->load->view('extension/demo/common/footer', $data);
	}
}

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<a href="{{ demofooter }}">Demo Footer</a>