duplicare

#include <iostream>
using namespace std;
void duplicare(int n,int &d)
{
    int c=n,v[10000],nr=0,i;
    do
    {
        c=c/10;
        nr=nr+1;
    }
    while (c!=0);
    for (i=nr;i>=1;i--)
    {
        v[i]=n%10;
        n=n/10;
    }
    for (i=1;i<=nr;i++)
    {
        d=d*10+v[i];
        if (v[i]%2==0) d=d*10+v[i];
    }
}
int main()
{
    int n,d=0;
    cin >> n;
    duplicare(n,d);
    cout << d;
    return 0;
}