Add external js file to footer with id

You can use the script_loader_tag hook

function enqueue_validation_script() {
    wp_register_script( 'validation', 'https://www.asd.in/script.php?id=3ff00a469474bbe71a9218a7f0377518', array( 'jquery' ) );
    wp_enqueue_script( 'validation' );
}
add_action('wp_enqueue_scripts', 'enqueue_validation_script');

function add_id_to_validation_script( $tag, $handle, $src ) {
    if ( 'validation' === $handle ) {
        $tag = '<script type="text/javascript" id="3ff00a469474bbe71a9218a7f0377518" src="'.$src.'"></script>';
    }
    return $tag;
}
add_filter( 'script_loader_tag', 'add_id_to_validation_script', 10, 3 );