string reverseWords(string s) {
words[words.size()-1]+=w;
// cout<< words[words.size()-1]<<endl;
words[words.size()-1]=words[words.size()-1].substr(1,words[words.size()-1].length()-1);
// cout<< words[0]<<words[1]<<endl;
// words[words.size()-1]+=' ';
for(int i=w.length()-1;i>=0;i--)