String builder

 Following is the code for string builder:

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#include <iostream>
#include "bits/stdc++.h"
using namespace std;

class stringbuilder{
private:
    vector<string> words;
    vector<char> complete_string;
    string concatenate_string()
public:
    void insert_words(string s);
    string get_string();
};

void stringbuilder::insert_words(string s){
    words.push_back(s);
}

string stringbuilder::get_string(){
    string ret;
    for(string x:words){
        ret += x;
    }
    return ret;
}

int main()
{

    stringbuilder sb;
    string str[] = {"Yalmuri ", "Sreenivasulu ", "Reddy."};
    for(string x : str)
    sb.insert_words(x);
    cout<<sb.get_string()<<endl;
    return 0;
}