public ActionResult <GeneralStatisticsViewModel> GetGeneralStatistics()
        {
            var generalStatisticsViewModel = new GeneralStatisticsViewModel()
            {
                NumberOfCompanies   = _companyService.CountCompanies(),
                NumberOfStudents    = _studentService.CountStudents(),
                NumberOfInternships = _internshipService.CountInternships()
            };

            return(Ok(generalStatisticsViewModel));
        }