Transpose.String C# (CSharp) Method

    public static string String(string input)
    {
        throw new NotImplementedException("You need to implement this function.");
    }
}

    public void Single_line()
    {
        var input    = "Single line.";
        var expected =
            "S\n" +
            "i\n" +
            "n\n" +
            "g\n" +
            "l\n" +
            "e\n" +
            " \n" +
            "l\n" +
            "i\n" +
            "n\n" +
            "e\n" +
            ".";

        Assert.Equal(expected, Transpose.String(input));
    }