public static Student GetStudentDataByUser(User user)
{
if (user == null || user.FakNum == null)
{
Console.WriteLine("No such student!"); return(null);
}
Student student = StudentData.foundStudentByNumber(user.FakNum);
if (student == null)
{
Console.WriteLine("No such student!"); return(null);
}
return(student);
}