Using a child theme, add a custom logo URL?

I tried other methods like this one but they don’t seem to work in the functions.php of the child theme. Here’s how I Set it up. Am I doing it wrong? Thanks!

<?php

/*
* Add your own functions here. You can also copy some of the theme functions into this file.

add_filter(‘avf_logo_link’, ‘change_logo_url’);
function change_logo_url() {
$link = “https://agilebits.com&#8221;;
return $link;
}

* WordPress will use those functions instead of the original functions then.
*/