private void fixTree(Node<K, V> node)
    {

        if (node.getRight().getColour() == "red" && node.getLeft().getColour() != "red")
        {
            node = rotateLeft(node);
        }

        if (node.getLeft().getColour() == "red" && node.getLeft().getLeft().getColour() == "red")
        {
            node = rotateRight(node);
        }

        if (node.getLeft().getColour() == "red" && node.getRight().getColour() == "red")
        {
            node.makeRed();
            node.getLeft().makeBlack();
            node.getRight().makeBlack();
        }

    }