How to finalize a function for Wordpress?

Question

WordPress

Hello!
How to improve the function of generating photos uploaded to WordPress, so that when uploading files like "20180808234302.jpg", "20180808234303.jpg", "20180808234304.jpg", etc., files of the form "20180808234302-1.jpg", " 20180808234303-2.jpg", "20180808234304-3.jpg" ? Those. numbering was added to the uploaded files. Please provide a solution.
Thank you!
The code itself:

function make_filename($filename) {
    $info = pathinfo($filename);
    $ext  = empty($info['extension']) ? '' : '.' . $info['extension'];
    return date("YmdHis") . $ext;
}
add_filter('sanitize_file_name', 'make_filename', 10);