public IActionResult Index(IndexViewModel vm)
        {
            //calling GetAll() through the service
            vm.AllNumbers = _service.GetAll(vm.Number.Num);

            //calling GetEven() through the service
            vm.EvenNumbers = _service.GetEven(vm.Number.Num);

            //calling GetOdd() through the service
            vm.OddNumbers = _service.GetOdd(vm.Number.Num);

            //calling GetFibo() through the service
            vm.FiboNumbers = _service.GetFibo(vm.Number.Num);

            vm.Message = _service.Message(vm.Number.Num);
            return(View(vm));
        }