correct Js code

<script>
(function($) {
    $(document).ready(function() {
        function gtag_report_conversion(url) {
            var callback = function () {
                if (typeof(url) != 'undefined') {
                    window.location = url;
                }
            };
            gtag('event', 'conversion', {
                'send_to': 'AW-840283043/8KgICOb2t3cQo-fWkAM',
                'event_callback': callback
            });
            return false;
        }
        $( ".et_pb_contact_form_0 .et_pb_contact_submit" ).click(function() {
            gtag_report_conversion();
        });
    });
})(jQuery);
</script>