private async Task <IEnumerable <Holiday> > GetHolidaysByStateAsync(string countryIsoCode, string stateIsoCode, int year)
{
if (!await HolidaysAlreadyExist(countryIsoCode, year))
{
await CreateHoliday(countryIsoCode, year);
}
return(await HolidayRepository.GetHolidaysByStateAsync(countryIsoCode, stateIsoCode, year));
}