public async Task <IActionResult> GetCovidDataCountryList()
        {
            var countryList = await _repo.GetCovidDataCountryListAsync();

            if (countryList == null)
            {
                return(BadRequest("No data found!"));
            }

            var countryListToReturn = _mapper.Map <List <CountryDataDTO> >(countryList);

            return(Ok(countryListToReturn));
        }