This code dosen't give any output

#1 
#include<bits/stdc++.h>
using namespace std;

void permute(char *a, int i, set<string> s)
{
    if(a[i] == '\0')
    {
        string t(a);
        s.insert(t);
        return;
    }

    for(int j = i; a[j] != '\0'; j++)
    {
        swap(a[i], a[j]);
        permute(a, i + 1, s);
        swap(a[i], a[j]);
    }
}

int main()
{
    char a[100];
    cin >> a;
    set<string> s;
    permute(a, 0, s);

    for(auto str:s)
    {
        cout << str << ",";
    }
}
#2

hello @tAkshat
pass ur set by reference

#3

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