Remove child category in permalinks Wordpress

functions.php

/*
* 
* Remove child categories from permalink in Wordpress
* https://www.vietrick.com/remove-child-category-in-permalink/
*
*/

function remove_child_categories_from_permalinks( $category ) {
    while ( $category->parent ) {
        $category = get_term( $category->parent, 'category' );
    }
    return $category;
}
add_filter( 'post_link_category', 'remove_child_categories_from_permalinks', 999 );
// Wordpress Settings > Permalinks > Save Changes to refresh.