private static void ReportTest()
        {
            Patient patient = new Patient
            {
                Id        = 1,
                FirstName = "Marcin",
                LastName  = "Sulecki"
            };

            Visit visit = new Visit
            {
                Patient     = patient,
                TotalAmount = 150,
                Duration    = TimeSpan.FromHours(1)
            };

            BuilderBase builder = new HtmlBuilder(visit);

            builder.AddHeader();
            builder.AddContent();
            builder.AddFooter();

            string result = builder.Build();

            Console.WriteLine(result);
        }