define model quiz

app/lib/features/quiz_exercise/presentation/model/answer.dart

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+import 'aspect.dart';
+import 'explanation.dart';
+
+class Answer {
+  final Aspect aspect;
+  final List<dynamic> correctAnswer;
+  final Explanation explanation;
+
+  Answer({
+    required this.aspect,
+    required this.correctAnswer,
+    required this.explanation,
+  });
+
+  factory Answer.fromJson(Map<String, dynamic> json) {
+    return Answer(
+        aspect: Aspect.fromJson(json['aspect'] as Map<String, dynamic>),
+        correctAnswer:
+            json['correctAnswer'].cast<Map<String, dynamic>>() as List<dynamic>,
+        explanation:
+            Explanation.fromJson(json['explanation'] as Map<String, dynamic>));
+  }
+}

app/lib/features/quiz_exercise/presentation/model/aspect.dart

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+class Aspect {
+  final String content;
+  final String label;
+  Aspect({required this.content, required this.label});
+
+  factory Aspect.fromJson(Map<String, dynamic> json) {
+    return Aspect(
+      content: json['content'] as String,
+      label: json['label'] as String,
+    );
+  }
+}

app/lib/features/quiz_exercise/presentation/model/description.dart

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+class Description {
+  final String content;
+  Description({required this.content});
+
+  factory Description.fromJson(Map<String, dynamic> json) {
+    return Description(content: json['content'] as String);
+  }
+}

app/lib/features/quiz_exercise/presentation/model/explanation.dart

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+class Explanation {
+  final String content;
+
+  Explanation({required this.content});
+
+  factory Explanation.fromJson(Map<String, dynamic> json) {
+    return Explanation(
+      content: json['content'] as String,
+    );
+  }
+}

app/lib/features/quiz_exercise/presentation/model/options.dart

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+class Options {
+  final String content;
+  final String id;
+  Options({required this.content, required this.id});
+
+  factory Options.fromJson(Map<String, dynamic> json) {
+    return Options(
+      content: json['content'] as String,
+      id: json['id'] as String,
+    );
+  }
+}

app/lib/features/quiz_exercise/presentation/model/questions.dart

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+import 'options.dart';
+
+class Question {
+  final String content;
+  final List<Options> options;
+
+  Question({required this.content, required this.options});
+
+  factory Question.fromJson(Map<String, dynamic> json) {
+    return Question(
+      content: json['content'] as String,
+      options: json['options'].cast<Map<String, dynamic>>() as List<Options>,
+    );
+  }
+}

app/lib/features/quiz_exercise/presentation/model/quiz_exercise.dart

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+import 'description.dart';
+import 'questions.dart';
+
+class QuizExerciseModel {
+  final String id;
+  final String country;
+  final String challengeGroup;
+  final String title;
+  final String type;
+  final String source;
+  final Description description;
+  final Question question;
+
+  QuizExerciseModel({
+    required this.id,
+    required this.country,
+    required this.challengeGroup,
+    required this.title,
+    required this.source,
+    required this.type,
+    required this.description,
+    required this.question,
+  });
+
+  factory QuizExerciseModel.fromJson(Map<String, dynamic> json) {
+    return QuizExerciseModel(
+      id: json['id'] as String,
+      country: json['country'] as String,
+      challengeGroup: json['challenge_group'] as String,
+      title: json['title'] as String,
+      source: json['source'] as String,
+      type: json['type'] as String,
+      description:
+          Description.fromJson(json['description'] as Map<String, dynamic>),
+      question: Question.fromJson(json['question'] as Map<String, dynamic>),
+    );
+  }
+}

app/lib/features/quiz_exercise/presentation/repositories/quiz_exercise.dart

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+