[Programmers]문자열 곱하기

https://school.programmers.co.kr/learn/courses/30/lessons/181940

#include <string>
#include <vector>

using namespace std;

string solution(string my_string, int k) {
    string answer = "";
    
    while(k>0){
      for(auto str : my_string){
            answer.push_back(str);
        }  
        k--;
    }
    
    return answer;
}