being interviewer - sentence reverse

sentenceReverse.cpp

#include <iostream>
#include <vector>

using namespace std;

vector<char> reverseWords( const vector<char>& arr ) 
{
  vector<char> ans;
  int i;
  int length = arr.size();
  for( i = length - 1; i >= 0; i-- )
  {
    bool currentIsSpace = arr[i] == ' ';
    bool nextOneTrue = (i - 1) >= 0 ;  // left to right 
    
    bool nextIsChar = currentIsSpace && nextOneTrue && arr[i - 1] != ' ';
    bool multipleSpace = currentIsSpace && nextOneTrue && arr[i - 1] == ' ';
      
    if(nextIsChar || i == 0){  // "a"  " " " " "b"
      
      for( int j = (i == 0? 0: 1); (i + j) < arr.size() && arr[i + j] != ' ' ; j++) // 
      {
        ans.push_back(arr[i + j]);
      }
      
      ans.push_back(' ');
    }
    else if(multipleSpace)
    {
      ans.push_back(arr[i]);
    }
  }
  
  
  return ans;

  
}

int main() {
  return 0;
}

//"a cb cd" ->
//  "a", "b", "cd" -> "cd", "b", "a"
//  "cd b a"