Menghapus Bilangan Genap Double Linked List

//Khisby Al Ghofari
//06.2017.1.06852
#include <iostream>

using namespace std;

struct simpul{
    int data;
    simpul *next;
    simpul *prev;
};


int main()
{

    simpul *baru,*bantu,*bantu2,*bantu3,*awal=NULL,*akhir=NULL;
    int input;
    cout << "Masukkan Jumlah Angka : ";
    cin >> input;

    for(int i=1;i<=input;i++){
        baru = new simpul;
        baru->data = i;
        baru->next = NULL;
        baru->prev = NULL;


        if(akhir== NULL){
            awal = baru;
            akhir = baru;
        }else{
            akhir->next = baru;
            baru->prev = akhir;
            akhir=baru;
        }
    }

    cout << endl;
    cout << "=============Tampilkan===============" << endl;
    bantu = awal;
    while(bantu!=NULL){
        cout << bantu->data << ",";
        bantu = bantu->next;
    }
    cout << endl;

    cout << endl;
    cout << "=============Menghapus Genap===============" << endl;
    bantu = awal;
    while(bantu!=NULL){
        if(bantu->data % 2 != 0){
            if(bantu->next != NULL){
               if(bantu->next->next !=NULL){
                    bantu2 = bantu->next;
                    bantu3 = bantu2->next;
                    bantu->next = bantu3;
                    bantu3->prev = bantu;
                    delete bantu2;
               }else{
                    bantu2 = bantu->next;
                    bantu->next = NULL;
                    delete bantu2;
               }
            }
        }
        bantu = bantu->next;
    }

    cout << endl;
    cout << "=============Tampilkan Hasil===============" << endl;
    bantu = awal;
    while(bantu!=NULL){
        cout << bantu->data << ",";
        bantu = bantu->next;
    }
    cout << endl;
}