public static int getRightChildOrder(int nodeOrder) {
        return (nodeOrder << 1) + 2;
    }
@Test
    public void testRightChildOrder() {
        assertEquals(2, MerkleTreeUtil.getRightChildOrder(0));
        assertEquals(4, MerkleTreeUtil.getRightChildOrder(1));
        assertEquals(6, MerkleTreeUtil.getRightChildOrder(2));
        assertEquals(8, MerkleTreeUtil.getRightChildOrder(3));
        assertEquals(12, MerkleTreeUtil.getRightChildOrder(5));
    }