Here you go , put after head or body or etc place

<script type='text/javascript'>

var blog = document.location.hostname;

var slug = document.location.pathname;

var ctld = blog.substr(blog.lastIndexOf(&quot;.&quot;));

if (ctld != &quot;.com&quot;) {

var ncr = &quot;http://&quot; + blog.substr(0, blog.indexOf(&quot;.&quot;));

ncr += &quot;.blogspot.com/ncr&quot; + slug;

window.location.replace(ncr);

}

</script>