обработка строк - C++

#include <iostream>
#include <string>
#include <boost/algorithm/string.hpp>
 
int main(){
    std::string s="mama  mila ramy, mama Mila Ramy";
    boost::algorithm::ireplace_all(s, "mila ramy", "ne vimila okno");
    std::cout<<s<<"\n";
    return 0;
}