Why this approach is not working in recursively removing duplicates from string

#1

#include<bits/stdc++.h>
using namespace std;
void replacei(string & s,string & t,int i=0){
t=t+s[i];
if(i==s.length()-1)return ;
if(s[i]!=s[i+1])return replacei(s,t,i+1);
return replacei(s,t,i+2);
}
int main(){
string s,t="";cin>>s;
replacei(s,t);
cout<<t;
return 0;
}

#2

Hey @argus
check for
aaaa ,it wont work

#include<bits/stdc++.h>
using namespace std;
void replacei(string & s,string & t,int i=0){
t=t+s[i];
if(i==s.length()-1)return ;
if(s[i]!=s[i+1])return replacei(s,t,i+1);
t.pop_back();//dup character we pushed in t 
return replacei(s,t,i+1);//i+1 here
}
int main(){
string s,t="";cin>>s;
replacei(s,t);
cout<<t;
return 0;
}
#3

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#4

t.po_back not working in code blocks

#5

Please share the screenshot of the error