how to edit a specific post slug using a php code?

try this
$post_id = 11;
$post = get_post($post_id);
$slug = $post->post_name;
<a href="https://wordpress.stackexchange.com/questions/196045/<?php get_site_url(); ?>/abstract/<?php echo $slug; ?>" title="<?php the_title_attribute(); ?>">Abstract</a>

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