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WordPress How to Build a WordPress Plugin Building WordPress Widgets, and Shortcodes WordPress Widgets Code Challenges

What do i do wrong on this piece of code i get a fail message

This is the code that i'am applying:

function widget( $args, $instance ) { // Widget output

        $title = apply_filters('widget_title', $instance['title']);


The code challenge keeps saying that the first thing to do is call the extract function. But i'am doing just that, so what is wrong with my code


    class My_Plugin_Widget extends WP_Widget {

        function my_plugin_widget() {
            parent::__construct( false, 'My Plugin Widget' );

        function widget( $args, $instance ) {
        // Widget output

      $title = apply_filters('widget_title', $instance['title']);


      function update( $new_instance, $old_instance ) {
        // Save widget options

      $instance = $old_instance;

            $instance['title'] = strip_tags($new_instance['title']);

            return $instance;

      function form( $instance ) {
        // Output admin widget options form

      $title = esc_attr($instance['title']);