C++ string Insert a substring at insertion point

#include <cstdlib>
#include <cstdio>
#include <iostream>
using namespace std;

string insertPhrase(const string& source)
{
    string s = source;//from w ww  . j a va  2  s .c o  m
    size_t offset = s.find("<ip>");
    if (offset != string::npos)
    {
        s.erase(offset, 4);
        s.insert(offset, "Randall");
    }
    return s;
}


int main(int argc, char* pArgs[])
{
    string s3 = "Stephen <ip> Davis";
    cout << s3 + " -> " + insertPhrase(s3) << endl;

    return 0;
}