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