getCountryFromCode function
Get country from its ISO CODE
Implementation
Future<Country?> getCountryFromCode(String countryCode) async {
final cities = await _loadCountries();
final res = cities.where((country) {
return country.isoCode == countryCode;
}).toList();
res.sort((a, b) => a.name.compareTo(b.name));
return res.isEmpty ? null : res.first;
}