public async Task <IActionResult> PostSolvedQuiz(UserSolvedQuiz solvedQuiz)
        {
            var result = await _solvingQuizzesService.CheckSolvedQuizAsync(solvedQuiz, UserId);

            if (result == null)
            {
                return(BadRequest());
            }
            await _statisticsService.IncreaseSolveSessions(solvedQuiz.QuizId);

            return(Ok(result));
        }