replace apar

//https://pastebin.com/mhPBmQc2
#include <bits/stdc++.h>
using namespace std;

int main()
{
    char s[101], a[101], b[101],aux[100];
    char *p;
    cin.getline(s, 101);
    cin.getline(a, 101);
    cin.getline(b, 101);
    while (p = strstr(s, a))
    {
        strcpy(aux, b);
        strcat(aux, p + strlen(a));
        strcpy(p,aux);
    }
    puts(s);
    return 0;
}