static void Main()
        {
            var fem = new FileExtensionManager();

            fem.FileName = "example";
            Console.WriteLine("Extension ->" + fem.GetFileExtension());
            Console.WriteLine("File name ->" + fem.GetFileNameWithoutExtension());

            fem.FileName = "example.pdf";
            Console.WriteLine("Extension ->" + fem.GetFileExtension());
            Console.WriteLine("File name ->" + fem.GetFileNameWithoutExtension());

            fem.FileName = "example.new.pdf";
            Console.WriteLine("Extension ->" + fem.GetFileExtension());
            Console.WriteLine("File name ->" + fem.GetFileNameWithoutExtension());

            Console.WriteLine("Distance in the 2D space = {0:f2}",
                              Geometry.CalcDistance2D(1, -2, 3, 4));
            Console.WriteLine("Distance in the 3D space = {0:f2}",
                              Geometry.CalcDistance3D(5, 2, -1, 3, -6, 4));

            double width  = 3;
            double height = 4;
            double depth  = 5;

            Console.WriteLine("Volume = {0:f2}", Geometry.CalcVolume(width, height, depth));
            Console.WriteLine("Diagonal XYZ = {0:f2}", Geometry.CalcDiagonalXYZ(width, height, depth));
            Console.WriteLine("Diagonal XY = {0:f2}", Geometry.CalcDiagonalXY(width, height));
            Console.WriteLine("Diagonal XZ = {0:f2}", Geometry.CalcDiagonalXZ(width, depth));
            Console.WriteLine("Diagonal YZ = {0:f2}", Geometry.CalcDiagonalYZ(height, depth));
        }
        static void Main()
        {
            var fem = new FileExtensionManager();

            fem.FileName = "example";
            Console.WriteLine("Extension ->" + fem.GetFileExtension());
            Console.WriteLine("File name ->" + fem.GetFileNameWithoutExtension());

            fem.FileName = "example.pdf";
            Console.WriteLine("Extension ->" + fem.GetFileExtension());
            Console.WriteLine("File name ->" + fem.GetFileNameWithoutExtension());

            fem.FileName = "example.new.pdf";
            Console.WriteLine("Extension ->" + fem.GetFileExtension());
            Console.WriteLine("File name ->" + fem.GetFileNameWithoutExtension());

            Console.WriteLine("Distance in the 2D space = {0:f2}",
                Geometry.CalcDistance2D(1, -2, 3, 4));
            Console.WriteLine("Distance in the 3D space = {0:f2}",
                Geometry.CalcDistance3D(5, 2, -1, 3, -6, 4));

            double width = 3;
            double height = 4;
            double depth = 5;

            Console.WriteLine("Volume = {0:f2}", Geometry.CalcVolume(width, height, depth));
            Console.WriteLine("Diagonal XYZ = {0:f2}", Geometry.CalcDiagonalXYZ(width, height, depth));
            Console.WriteLine("Diagonal XY = {0:f2}", Geometry.CalcDiagonalXY(width, height));
            Console.WriteLine("Diagonal XZ = {0:f2}", Geometry.CalcDiagonalXZ(width, depth));
            Console.WriteLine("Diagonal YZ = {0:f2}", Geometry.CalcDiagonalYZ(height, depth));
        }