private func createStudenten() {
 liste.append(Student("Meier", 25345,1,true))
 liste.append(Student("Müller", 24645,2,false))
 liste.append(Student("Kunau", 23565,5,true))
 liste.append(Student("Kühne", 21645,6,true))
 liste.append(Student("Mattes", 12645,14,true))
 liste.append(Student("Bosch", 21342,7,true))
 liste.append(Student("Hüffner", 23342,4,true))
 liste.append(Student("Brandt", 21342,7,true))
 liste.append(Student("Schmittel", 23342,1,true))
 liste.append(Student("Huffman", 24342,2,false))
 liste.append(Student("Steffan", 23417,2,true))
 liste.append(Student("Fischer", 25342,1,false))
 liste.append(Student("Fleischer", 23342,1,true))
 liste.append(Student("Zwick", 25242,1,false))
 liste.append(Student("Reinhard", 23542,1,true))
}