fetchQuestionnaire method Null safety

Future<Questionnaire> fetchQuestionnaire(
  1. String params
)

Implementation

static Future<Questionnaire> fetchQuestionnaire(String params) async {
    String aber = "https://opentdb.com/api.php?$params";
    final response = await http.get(Uri.parse(aber)); //&type=boolean
    if (response.statusCode == 200) {
        return Questionnaire.fromJson(jsonDecode(response.body));
    } else {
        throw Exception('Failed to load questions');
    }
}