static void Main(string[] args)
{
University university = new University("CH.U.I.");
university.AddStudent(new Student("Andrew Kostenko", 4));
university.AddStudent(new Student("Julia Veselkina", 5));
university.AddStudent(new Student("Maria Perechrest", 3));
Internship internship = new Internship("Interlink");
internship.enrollStudent(university);
Console.WriteLine("List of internship's students:");
Console.WriteLine(internship.getStudents());
}