Спринт 1. Алгоритм accumulate. Задание 2.

#include <set>
#include <string>
#include <numeric>
#include <iostream>

using namespace std;

string TailStopWords (string res, const string& word){
    return res+="-"s+word+" ";
}

string AddStopWords(const string& query, const set<string>& stop_words) {
     if (stop_words.empty()){
        return query;
    }
    string str = accumulate(stop_words.begin(), stop_words.end()," "s, TailStopWords);
    return query+str;
}

int main(){
    string query = "some tasty oranges";
    set<string> stop_words = {"of", "in"};
    cout<<AddStopWords(query, stop_words)<<endl;
}