How to remove extra space while printing output of reversed string

Question

I am writing a program to reverse the order of words in a string. If there is a sentence,

I love New York!

It should be changed to,

!York New love I

I'm reversing the order of words in a string by storing the last word and then adding space and then storing the second last and so on. But when I print the output it adds a space before printing.

#include<iostream>
#include<string>
#include<vector>
#include<sstream>
using namespace std;
string reverse(string s){
    vector<string> temp;
    string words;
    stringstream ss(s);
    while (ss>>words)
    {
        temp.push_back(words);
    }
    string ans;
    for (int i = words.size()-1; i >=0; --i)
    {
        if (i!=words.size()-1)
        {
            ans+= " ";
        }
        ans+=temp[i];
    }
    return ans;
}
int main(){
    string s("My name is Saad Arshad ");
    cout<<reverse(s);
    return 0;
}

OUTPUT:

" Arshad Saad is name My"

I think the size of words is greater than that of temp thats why its happening but I still need more clarification.