using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        var imageFilePath = "vpo/test/test.img";

            var imageFileName = Path.GetFileNameWithoutExtension(imageFilePath);

            var imageExt = Path.GetExtension(imageFilePath);

        var suffix = "_front";

        Console.WriteLine($"{imageFileName}{suffix}.{imageExt}");

    }

}