public async Task <IActionResult> AddCity(Guid countryId, List <City> cities)
        {
            if (countryId == null || string.IsNullOrWhiteSpace(countryId.ToString()) || cities == null || cities.Count == 0)
            {
                return(BadRequest());
            }

            var country = await _service.AddCities(countryId, cities);

            if (country == null)
            {
                return(BadRequest("Something went wrong. Please try again."));
            }

            return(Ok(country));
        }