whenever i save my html file, a random cloudflare script keeps appearing at end of my script

<script src="/cdn cgi/scripts/7d0fa10a/cloudflare static/rocket loader.min.js" data cf settings="515f0471c42d5ff9535fd3fe 49" defer </script <script (function(){function c(){var b=a.contentDocument (a.contentWindow&&a.contentWindow.document);if(b){var d=b.createElement('script');d.innerHTML="window. CF$cv$params={r:'a2a8ac5f38b733da',t:'MTc4NjYzNDEwNg=='};var a=document.createElement('script');a.src='/cdn cgi/challenge platform/scripts/jsd/main.js';document.getElementsByTagName('head')[0].appendChild(a);";b.getElementsByTagName('head')[0].appendChild(d)}}if(document.body){var a=document.createElement('iframe');a.height=1;a.width=1;a.style.position='absolute';a.style.top=0;a.style.left=0;a.style.border='none';a.style.visibility='hidden';document.body.appendChild(a);if('loading'!==document.readyState)c();else if(window.addEventListener)document.addEventListener('DOMContentLoaded',c);else{var e=document.onreadystatechange function(){};document.onreadystatechange=function(b){e(b);'loading'!==document.readyState&&(document.onreadystatechange=e,c())}}}})();</script a code like this keeps appearing in my code after i save my file