Reverse words in a given string

revwrd.cpp

#include <iostream>
#include <string>
#include <algorithm>

void solution(std::string str) {
    str += " ";
    auto size = str.size();
    size_t start = 0;
    for(size_t i = 0; i < size; i++) {
        size_t end = str.find(' ', start);

        if(end == std::string::npos) {
            end = str.size() - 1;
        }

        std::string subs = str.substr(start, end - start + 1);
        std::reverse(std::begin(subs), std::end(subs));
        str.replace(start, end - start + 1, subs);
        start = end + 1;
    }

    std::cout << "\nstr:" << str << std::endl;
}

int main() {
    solution(std::string("hello friend. it's a sloppy way"));
    return 0;
}