Hangman Updated

#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <stdlib.h>

int main()
{
    srand(time(NULL));
    std::cout << "Loading..." << std::endl;
    std::ifstream stream("words.txt");
    std::vector<std::string> words;
    std::string line;

    while (std::getline(stream, line))
    {
        words.push_back(line);
    }

    std::string solution = words.at((rand() * rand())%words.size());
    std::string current;
    current.assign(solution.length(), '-');
    std::string entered;
    int lives = 10;

    while (!(lives == 0 || solution == current))
    {
        system("cls");
        bool found = 0;
        std::cout << current << std::endl;
        std::cout << "enter a letter, you currently have: " << lives << " lives" << std::endl;
        std::cout<< "Wrong characters: " << entered << std::endl;
        std::string c;
        std::cin >> c;
        std::string old  = current;
        if (c.size() > 1)
        {
            if (c == solution)
            {
                current = solution;
            }
            else
            {
                --lives;
            }
        }
        else
        {
            for (int i = 0; i < solution.length(); ++i)
            {
                char s = solution.at(i);
                if (s == c[0])
                {
                    current[i] = s;
                }
            }
            if (old == current)
            {
                --lives;
                entered += c[0];
            }
        }
    }
    if (!(lives == 0))
    {
        std::cout << " You have finished the game, conGratz !!! *fireworks*" << std::endl;
    }
    else
    {
        std::cout << "You loose, BAKA" << std::endl;
        std::cout << "The word you were looking for was: " << solution << std::endl;
    }
}