All test case not passing

#1

#include
using namespace std;
void duplicate(charin,charop,int i,int j)
{
if(in[i]==’\0’)
{
op[j]=’\0’;
return;
}

op[j]=in[i];
if(op[j]==op[j-1] )
{
    op[j]=in[i+1];
    i++;
    if(op[j]==op[j-1])
    {
        op[j]=in[i+1];
    }
}
cout<<op[j];
duplicate(in,op,i+1,j+1);

}
int main()
{
char in[1000];
cin>>in;
char op[1000];
duplicate(in,op,0,0);

return 0;

}
THIS IS THE CODE I AM GETTING THE ANS CORRECT BUT IT IS PASSING ONLY 1 TESTCASE. KINDLY TELL

#2

https://ide.codingblocks.com/s/202190 LINK TO THE CODE

#3

Consider a input:
aaaaaaaaaaa

Your o/p:
aaaaa

Dry run with this and recheck your logic.

#4

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