Your next assignment - WP Plugin dev

hello-world.php

<?php
/*
Plugin Name: Hello World New
*/

function hello_world_new() {
    return '<p>Hello World!</p>';
}

add_shortcode( 'hello_world_new', 'hello_world_new' );
add_shortcode( 'hello_world_short', 'hello_world_new' );

add_action( 'footer', 'hello_world_new_menu' );

/* Assignment *

// TODO: Use add_filter() to add a filter to the hello_world_new shortcode or dop anything with add_filter.

// add_filter(