if (! defined('WP_DEBUG')) {
	die( 'Direct access forbidden.' );
}

add_action( 'wp_enqueue_scripts', function () {
	wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );
});
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://royalbedec.com/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://royalbedec.com/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://royalbedec.com/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://royalbedec.com/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://royalbedec.com/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>