How do I get the category URL from get_the_category?

My loop below shows the latest 4 posts from the same category as the post currently being viewed. Its located within single.php.

I’m trying to get the URL of that same category so I can link back to category.php to view all posts from that same category. I thought grabbing the category slug would work but my code below doesn’t output anything:

<?php
global $post;
$categories = get_the_category();

    foreach ($categories as $category) :

       $exclude = get_the_ID();
       $posts = get_posts('posts_per_page=4&category='. $category->term_id);

        foreach($posts as $post) :
         if( $exclude != get_the_ID() ) { ?>

                <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" class="post c-1"> Link to actual post</a>

    <?php } endforeach; ?>

<a href="<?php bloginfo('url'); ?>/categories/<?php echo $childcat->cat_slug; ?>" title="View all" class="btn border"><i class="i-right-double-arrow"></i> View all <?php echo $childcat->cat_slug; ?></a>
<?php  endforeach; wp_reset_postdata(); ?>