I am getting the correct replacement however why is the last character missing from all the strings

#1

#include
#include
using namespace std;

string format(string s,int i,string &o){

if(s[i+1]=='\0')
	return o;
if(s[i]=='p'&&s[i+1]=='i')
{	o+="3.14";
    return format(s,i+2,o);
}
	else
{	o+=s[i];
return format(s,i+1,o);}

}

int main() {

int n;
cin>>n;

while(n-->0)
{string s,o;
cin>>s;
cout<<format(s,0,o)<<endl;}

return 0;

}

#2

@amangupta please share your code by saving it on cb ide

#3

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