public void TestConvertStringToArray()
        {
            string numbers = "08 02 22 97 38 15";

            int[,] numbers2D  = problem11.ConvertStringToArray(numbers, 3, 2);
            int[,] expected2D = new int[3, 2] {
                { 8, 2 }, { 22, 97 }, { 38, 15 }
            };
            Assert.AreEqual(expected2D[2, 1], numbers2D[2, 1]);
        }