Add the site’s name as prefix when adding new users? Multisite

I have noticed that the code our friend shares has an error. Add the prefix twice.

I share other code with this error resolved.

<?php


add_filter( 'pre_user_login', 'sneakily_add_prefix_to_username' );

function sneakily_add_prefix_to_username( $username ) {
    if ( ! current_user_can( 'manage_network' ) ) {
        $blog_id = get_current_blog_id();
        $blog_details = get_blog_details( $blog_id );
        $sanitized_path = str_replace( "https://wordpress.stackexchange.com/", '', get_blog_details()->path );
        //error_log($sanitized_path);
        if ( $sanitized_path != '') {
            if(false === stripos($username, $sanitized_path)) {
                return $sanitized_path . '-' . $username;
            } else {
                return $username;
            }
        } else {
            $domain_parts = explode( '.', $blog_details->domain );
            if ( is_array( $domain_parts ) ) {
                $sanitized_subdomain = sanitize_user( $domain_parts[0], true );
                //error_log($sanitized_subdomain);
                if ( $sanitized_subdomain != '' ) {
                    if(false === stripos($username, $sanitized_subdomain)) {
                        return $sanitized_subdomain . '-' . $username;
                    } else {
                        return $username;
                    }
                }
            }
        }
    }
    return $username;
}