Check if last post

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<?php if( ($wp_query->current_post + 1) < ($wp_query->post_count) ) {
 // Do something if it's the last post.
};
?>

Instructions:

If you are using separators between your posts you probably don’t want one on the last post of the page.

Add the following conditional-tag inside your loop where you want to display/not display something if it’s on the last post.