c++ stacks and queues palindromes. Working but need a little help.

[rb26dett26]

I finished a program where it takes lines from a text file and tells you if it is a palindrome or not. While it does tell you if deed or maam is a palindrome,race car and words with spaces or question marks at the end don't satisfy the program even though it is a palindrome. Can anyone tell me how to make the program skip over the special characters like !,? etc and ignore the spaces but still keep the normal format when it prints?

heres my code

#include <string>
#include <stack>
#include <queue>
#include <iostream>
#include <list>
#include <fstream>

using namespace std;



void tokenize(string &X, string separators, list<string> &words)

{                             // extracts tokens from x and puts them in list
     int length = X.length();
     int first = X.find_first_not_of(separators,0);
     
     while (first>=0 && first<length)
     {
           int last = X.find_first_of(separators,first);
           if( last<0 || last > length) last = length;
           words.push_back(X.substr(first,last-first));
           first = X.find_first_not_of(separators,last+1);
           }
}    

bool palinstring(string &line)   // returns true if line contains palindrome
{
     stack<string> S;
     queue<string> Q;
     list<string> the_words;
     string one, two;
     
     tokenize(line," ,;:",the_words);
     
     list<string>::iterator start=the_words.begin();
     list<string>::iterator stop=the_words.end();
     
     while (start != stop)
     {
           S.push(*start);
           Q.push(*start);
           start++;
           }
           
    while (!Q.empty())  // checks to see if we have a palindrome
    {
          one = S.top(); S.pop();
          two = Q.front();Q.pop();
          if(one!=two) return false;
          }
          return true;
          }
          
  int main()
  {
      string line;
      ifstream pal ("pal.txt");
      
      while (getline(pal,line))
      {
            cout << line << " <= is " ;
            if (!palinstring(line)) cout << "not ";
            cout << "a palindrome\n";
            }
            system("pause");
            return 0;
            }
                                 
       

here is the output

Was it a car or a cat I saw? <= is not a palindrome
abcdefedcab <= is a palindrome
Niagara, O roar again <= is not a palindrome
Able was I ere I saw Elba <= is not a palindrome
radar <= is a palindrome
tenet <= is a palindrome
refer <= is a palindrome
deeded <= is a palindrome
no lemons, no melon <= is not a palindrome
notion <= is a palindrome
Otto <= is a palindrome
Emma <= is a palindrome
Anna <= is a palindrome
level <= is a palindrome
Madam, I'm Adam <= is not a palindrome
palindrome <= is a palindrome
racecar <= is a palindrome
salads <= is a palindrome
No, it is opposition <= is not a palindrome
read, dear <= is not a palindrome
Poor Dan is in a droop <= is not a palindrome
dented <= is a palindrome
deed <= is a palindrome

Press any key to continue . . .

thanks in advance