DLLNC Bubble Sort ID and Name

void tukar_posisi_mobil(int posisi_1, int posisi_2){
    //inisialisasi posisi pertama
    mobil_posisi = mobil_depan;
    if(posisi_1 == 1){
        mobil_simpan = mobil_posisi;
    }
    else{
        for(int x = 1; x<posisi_1; x++){
            mobil_simpan = mobil_posisi;
            mobil_posisi = mobil_posisi->next;
        }
    }

    mobil_tukar = mobil_posisi;

    temporary = new data_mobil;
    temporary->next = mobil_posisi->next;
    temporary->prev = mobil_posisi->prev;

    //inisialisasi Posisi kedua
    mobil_posisi = mobil_depan;
    if(posisi_2 == 1)
        mobil_bantu = mobil_posisi;
    else{
        for(int x = 1; x<posisi_2; x++){
            mobil_bantu = mobil_posisi;
            mobil_posisi = mobil_posisi->next;
        }
    }


    //penukaran
    if(posisi_2 == posisi_1-1 || posisi_2 == posisi_1+1){
        if(posisi_1 == 1){
            mobil_simpan->next = mobil_posisi->next;
            ((posisi_2 == banyak_mobil) ? mobil_belakang = mobil_simpan : mobil_posisi->next->prev = mobil_simpan);

            mobil_posisi->next = mobil_simpan;
            mobil_simpan->prev = mobil_posisi;

            mobil_depan = mobil_posisi;
        }
        else if(posisi_2 == 1){
            mobil_bantu->next = mobil_tukar->next;
            ((posisi_1 == banyak_mobil) ? mobil_belakang = mobil_bantu : mobil_tukar->next->prev = mobil_bantu);

            mobil_tukar->next = mobil_bantu;
            mobil_bantu->prev = mobil_tukar;

            mobil_depan = mobil_tukar;
        }
        else if(posisi_2 > posisi_1){
            mobil_tukar->next = mobil_posisi->next;
            ((posisi_2 == banyak_mobil) ? mobil_belakang = mobil_tukar : mobil_posisi->next->prev = mobil_tukar);

            mobil_posisi->next = mobil_tukar;
            mobil_tukar->prev = mobil_posisi;

            mobil_simpan->next = mobil_posisi;
            mobil_posisi->prev = mobil_simpan;
        }
        else{
            mobil_posisi->next = mobil_tukar->next;
            ((posisi_1 == banyak_mobil) ? mobil_belakang = mobil_posisi : mobil_tukar->next->prev = mobil_posisi);

            mobil_tukar->next = mobil_posisi;
            mobil_posisi->prev = mobil_tukar;

            mobil_bantu->next = mobil_tukar;
            mobil_tukar->next = mobil_bantu;
        }
    }

    else{
        if(posisi_2 == 1){
            mobil_tukar->next = mobil_bantu->next;
            mobil_bantu->next->prev = mobil_tukar;
            mobil_tukar->prev = NULL;

            mobil_depan = mobil_tukar;
        }
        if(posisi_1 == 1){
            mobil_bantu->next = mobil_simpan;
            mobil_simpan->prev = mobil_bantu;

            mobil_simpan->next = mobil_posisi->next;

            ((posisi_2 == banyak_mobil) ? mobil_belakang = mobil_simpan : mobil_posisi->next->prev = mobil_simpan);

            mobil_posisi->next = temporary->next;
            mobil_posisi->prev = NULL;

            mobil_depan = mobil_posisi;
        }
        if(posisi_1 != 1){
            mobil_tukar->next = mobil_posisi->next;
            ((posisi_2 == banyak_mobil) ? mobil_belakang = mobil_tukar : mobil_posisi->next->prev = mobil_tukar);
            mobil_bantu->next = mobil_tukar;
            mobil_tukar->prev = mobil_bantu;

            mobil_posisi->next = temporary->next;
            mobil_simpan->next = mobil_posisi;
            mobil_posisi->prev = mobil_simpan;
        }
    }
}

void bubble_sort_mobil_by_name(){
    mobil_posisi = mobil_depan;
    int i = 1, j, huruf1, huruf2;
    int a = 0;

    while(mobil_posisi != NULL){
        mobil_bantu = mobil_posisi->next;
        j = i+1;
        while(mobil_bantu != NULL){
            if(mobil_posisi->nama_mobil[0] > mobil_bantu->nama_mobil[0]){
                tukar_posisi_mobil(i, j);
            }
            else if(mobil_posisi->nama_mobil[0] == mobil_bantu->nama_mobil[0]){
                int arr = 0;
                while(mobil_posisi->nama_mobil[arr] != '\0'){

                    huruf1 = int(mobil_posisi->nama_mobil[arr]);
                    huruf2 = int(mobil_bantu->nama_mobil[arr]);

                    if(huruf1 < 97)
                        huruf1 = huruf1 + 32;
                    if(huruf2 < 97)
                        huruf2 = huruf2 + 32;

                    if(huruf1 > huruf2){
                        tukar_posisi_mobil(i, j);
                        break;
                    }

                    if(huruf1 < huruf2)
                        break;
                    arr++;
                }
            }
            j++;
            mobil_bantu = mobil_bantu->next;
        }
        temporary = mobil_depan;
        a++;
        cout<<"\n\nLiterasi ke-"<<a<<" : ";
        while(temporary != NULL){
            cout<<temporary->nama_mobil<<" ";
            temporary = temporary->next;
        }
        i++;
        mobil_posisi = mobil_posisi->next;
    }
}

void bubble_sort_mobil_by_id(){
    mobil_posisi = mobil_depan;
    int i = 1, j;
    int a = 0;
    while(mobil_posisi != NULL){
        mobil_bantu = mobil_posisi->next;
        j = i+1;

        while(mobil_bantu != NULL){
            if(mobil_posisi->id_mobil > mobil_bantu->id_mobil)
                tukar_posisi_mobil(i, j);
            j++;
            mobil_bantu = mobil_bantu->next;
        }
        temporary = mobil_depan;
        a++;
        cout<<"\n\nLiterasi ke-"<<a<<" : ";
        while(temporary != NULL){
            cout<<temporary->id_mobil<<" ";
            temporary = temporary->next;
        }
        i++;
        mobil_posisi = mobil_posisi->next;
    }
}