public void ZigZagConversionMethod2()
        {
            string value = ZigZag.ConvertZigZag("PAYPALISHIRING", 3);

            Assert.AreEqual("PAHNAPLSIIGYIR", value);
        }
        public void ZigZagConversionMethod3()
        {
            string value = ZigZag.ConvertZigZag("PAYPALISHIRING", 4);

            Assert.AreEqual("PINALSIGYAHRPI", value);
        }
        public void ZigZagConversionMethod1()
        {
            string value = ZigZag.ConvertZigZag("PAYPALISHIRING", 1);

            Assert.AreEqual("PAYPALISHIRING", value);
        }