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boolean isPalindrome(String s){
  if(s.length() == 0) return true;
  if(s.length() == 1) return true;
  char[] sa = s.toCharArray();
  Stack<Character> stk = new Stack<>();
  for(int i = 0; i < sa.length/2; i++){
      stk.add(sa[i]);   
  }
  int rightSideStart = sa.length/2;
  if(sa.length % 2 != 0) rightSideStart++;
  for(int i = rightSideStart; i < sa.length; i++){
      if(stk.pop() != sa[i]) return false;
  }
  return true;
}