class FranciscoAmbrozio

#include <iostream>
#include <string>
#include <assert.h>
using namespace std;

string str_replace(string searchString, string replaceString, string str)
{
    assert( searchString != replaceString );

    string::size_type pos = 0;
    while ( (pos = str.find(searchString, pos)) != string::npos ) {
        str.replace( pos, searchString.size(), replaceString );
        pos++;
    }
    return str;
}

int main()
{
    string somestr = “This is just a string”;
    string replaced = str_replace(“just”, “not”, somestr);
    cout << replaced << endl;
}