if( term_exists(get_the_title(), 'category' ))

$cat = get_term_by("slug", $post->post_name, "category");

              if($cat->parent !== 0) {

                    $catID = $cat->parent;
                } else {
                    $catID = $cat->term_id;
                }  

              $args = array(

                                'type'                      => 'post',
                                'child_of'                  => $catID,
                                'hide_empty'                  => false,
                                'hierarchical'              => true,
                                'exclude'                   => '1'
                            );
                $categories = get_categories($args);

              foreach($categories as $categorie) {

                    if($categorie->slug == $post->post_name) {
                        $clasa = "class='current'";
                    } else {
                        $clasa = "";
                    }
                    echo "<a ".$clasa." href='".home_url("/").$slug."/".$categorie->slug."'>".$categorie->name."</a>";
                }

if( term_exists(get_the_title(), 'category' ))

$cat = get_term_by("slug", $post->post_name, "category"); 

if($cat->parent !== 0) {
    $catID = $cat->parent;
} else {
    $catID = $cat->term_id;
}  

$args = array(
                'type'                      => 'post',
                'child_of'                  => $catID,
                'hide_empty'                  => false,
                'hierarchical'              => true,
                'exclude'                   => '1'
            );
$categories = get_categories($args);

foreach($categories as $categorie) {
    if($categorie->slug == $post->post_name) {
        $clasa = "class='current'";
    } else {
        $clasa = "";
    }
    echo "<a ".$clasa." href='".home_url("/").$slug."/".$categorie->slug."'>".$categorie->name."</a>";
}