static void Main(string[] args) { String fnom; String cer; Student stud; StudentData.addTestStudents(); Console.WriteLine("StudentRepository"); Console.WriteLine("F.Nom to print"); fnom = Console.ReadLine(); stud = StudentData.IsThereStudent(fnom); cer = StudentData.PrepareCertificate(ref stud); Console.WriteLine(cer); StudentData.SaveCertificate(cer); }