using System;

public class Program

{

    public static void Main()

    {

    }

    public static string DecimalCharacterCorrection(this string number)

    {

        string localChar = CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator;

        string wrongChar = localChar.Equals(".") ? "," : ".";

        return number?.Replace(wrongChar, localChar);

    }

    [Theory]

    [InlineData("abc", "abc", "abc")]

    [InlineData("1.1", "1,1", "1.1")]

    [InlineData("1.1", "1,1", "1,1")]

    [InlineData("1.1.1", "1,1,1", "1,1,1")]

    [InlineData("1.1.1", "1,1,1", "1.1.1")]

    public void DecimalCharacterCorrectionTest(string expectedDot, string expectedComma, string input)

    {

        string expected;

        if ("," == CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator)

        {

            expected = expectedComma;

        }

        else

        {

            expected = expectedDot;

        }

        Assert.Equal(expected, ImpExpUtil.DecimalCharacterCorrection(input));

    }

}