Creating custom menu template with registering location

functions.php

//Usage: creating custom menu in Wordpress panel with name as $menu_name value
// Next: calling right_custom_menu function where custom menu is needed as follows =>> if (function_exists(right_custom_menu())) right_custom_menu();

function right_menu_position() {
  register_nav_menu('nav_right',__( 'Prawe menu' ));
}
add_action( 'init', 'right_menu_position' );

function right_custom_menu() {
  $menu_name = 'nav_right'; // specify custom menu slug
  if (($locations = get_nav_menu_locations()) && isset($locations[$menu_name])) {
    $menu = wp_get_nav_menu_object($locations[$menu_name]);
    $menu_items = wp_get_nav_menu_items($menu->term_id);

    $menu_list = '<div class="right-menu-wrapper">' ."\n";
    foreach ((array) $menu_items as $key => $menu_item) {
      $title = $menu_item->title;
      $url = $menu_item->url;
      $target = $menu_item->target;
      $menu_list .= "\t\t\t\t\t". '<div class="toggle"><p><a href="'. $url .'" target="'.$target.'">'. $title .'</a></p></div>' ."\n";
    }
    $menu_list .= "\t\t\t". '</div>' ."\n";
  } else {
    // $menu_list = '<!-- no list defined -->';
  }
  echo $menu_list;
}