public MutableTree<T> removeSubtree(Node<T> rootSubTree) {
        if (this.root == rootSubTree) {
            this.root = null;
            return null;
        }

        removeSubtree(this.root, rootSubTree);

        return this;
    }

    private void removeSubtree(Node<T> rootNode, Node<T> rootSubTree) {

        if (rootNode.getChildren().size() == 0)
            return;

        if (!rootNode.getChildren().contains(rootSubTree)) {
            for (var child : rootNode.getChildren()) {
                removeSubtree(child, rootSubTree);
            }
        } else {
            rootNode.getChildren().remove(rootSubTree);
        }
    }