docs: public static void sortNode(TreeNode node, Comparator comparator) {
          TreeNodeList children = (TreeNodeList) node.getChildren();
  
          if (children != null && !children.isEmpty()) {
              Object[] childrenArray = children.toArray();
              Arrays.sort(childrenArray, comparator);
              for (int i = 0; i < childrenArray.length; i++) {
                  children.setSibling(i, (TreeNode) childrenArray[i]);
              }
  
              for (int i = 0; i < children.size(); i++) {
                  sortNode(children.get(i), comparator);
              }
          }
      }