Lowest catagory link

Atlast done it fully

$categories = get_the_category($post->ID);

foreach($categories as $category) :

    $children = get_categories( array ('parent' => $category->term_id ));
    $category_link = get_category_link($children);
    $has_children = count($children);

    if ( $has_children == 0 ) {
        $name=$category->name;
        $category_link = get_category_link($category);
        echo "<a href="https://wordpress.stackexchange.com/questions/161873/$category_link">$name</a>";
    }
endforeach;