static void MainOLD()
        {
            Employees employees = new Employees();

            Employee jesse = new DistributionManager();
            Employee walt  = new Cook();

            IVisitor payRise       = new IncomeVisitor();
            IVisitor extraVacation = new VacationVisitor();

            employees.Add(jesse);
            employees.Add(walt);

            employees.Accept(payRise);
            walt.Accept(extraVacation);
        }