//gets and returns offers html
        IEnumerable <XElement> GetOfferHtml(DateTime d)
        {
            CurrentDate = d;
            Offers      = GetDriverOffers();
            DailyOffers = GetDailyOffers(Offers.ToList());
            Offers      = GetDriverOffers().Distinct().ToList();
            var offers = Offers?.GroupBy(o => o.DepartureTime);

            string test = JsonConvert.SerializeObject(DailyOffers);

            return(offers?.FirstOrDefault(o => o.Key == d)?.Select(o =>
                                                                   new XElement("a",
                                                                                new XAttribute("campus", o.Campus),
                                                                                new XAttribute("arrivalTime", o.ArrivalTime),
                                                                                new XAttribute("class", "btn-success text-white p-1 rounded d-flex justify-content-center w-75 mx-auto"),
                                                                                new XAttribute("data-toggle", "modal"),
                                                                                new XAttribute("data-target", "#OffersModal"),
                                                                                new XAttribute("data-date", $"{d.Date}"),
                                                                                new XAttribute("data-offers", $"{test}"),
                                                                                "Offers"
                                                                                )
                                                                   ));
        }