Reverse words in a given string

reverseWords.cpp

/*
Given a String of length N reverse the words in it. Words are separated by dots.

  By : Varun Thakur
  Date : 31/07/2017 
*/
#include <bits/stdc++.h>
using namespace std;

void reverse(char *begin, char *end)
{
    char temp;
    
    while (begin < end)
    {
        temp = *begin;
        *begin++ = *end;
        *end-- = temp;
    }
}
void  reverseWords(string& str)
{
    int len = str.length();
    char *s = new char[len+1];
    copy(str.begin(),str.end(),s);
    s[len]='\0';
    
    char *word_begin = s;
    char *temp = s;
    
    while(*temp)
    {
        temp++;
        
        if(*temp == '\0')
        { 
            reverse(word_begin,temp-1);
        }
        else if(*temp == '.')
        {
            reverse(word_begin, temp-1);
            word_begin = temp+1;
        }
    }
    
    reverse(s,temp-1);
    
    str.assign(s,len);
}
int main() {
	//code
	int t;cin>>t;
	while(t--){
	    string s;cin>>s;
	    reverseWords(s);
	    cout<<s<<'\n';
	}
	return 0;
}