Like Post Button in wordpress - ajax

Question

I tried to make a Like button for Posts so i found this tutorial with a lot of searching
tutorial : https://www.atomicsmash.co.uk/blog/create-like-post-button-in-wordpress/
but not worked to me !
my code in functions.php
add_action( 'rest_api_init', function () {
register_rest_route( 'example/v2', '/likes/(?P<id>\d+)', array(
'methods' => array('GET','POST'),
'callback' => 'example__like',
) );
});
function example__like( WP_REST_Request $request ) {
// Custom field slug
$field_name = 'postlike';
// Get the current like number for the post
$current_likes = get_field($field_name, $request['id']);
// Add 1 to the existing number
$updated_likes = $current_likes + 1;
// Update the field with a new value on this post
$likes = update_field($field_name, $updated_likes, $request['id']);
return $likes;
}
in ajax
<script type="text/javascript">
$('.like__btn').on('click', function(){
// AJAX call goes to our endpoint url
$.ajax({
url: 'http://192.168.1.8/p-test/wp-json/example/v2/likes/7',
type: 'post',
success: function() {
console.log('works!');
},
error: function() {
console.log('failed!');
}
});
// Change the like number in the HTML to add 1
var updated_likes = parseInt($('.like__number').html()) + 1;
$('.like__number').html(updated_likes);
// Make the button disabled
$(this).attr('disabled', true);
});
</script>
in HTML
<button class="like__btn">
<span class="like__number"><?php the_field('postlike'); ?></span>
</button>
Which part of the tutorial did I make a mistake?
Thanks for any help