redirect to the newly saved post not working

I’m trying to redirect my form to new post using below code and

add_filter('cf7_2_post_form_append_output', 'redirect_on_submit', 10, 3);

but its not working….

If you wish to redirect to the newly saved post (assuming it is published, see FAQ #16),
if(isset($_GET[‘cf72post’])){
$post_id = get_transient($_GET[‘cf72post’]);
//get the link to the new post,
$url = get_permalink($post_id);
if ( wp_redirect( $url, 200 ) ) {
exit;
}
echo ‘unable to redirect, maybe the post wasn’t published’;
}

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