funcdef isPalindrome = func (str: string) -> bool {
  if len(str) == 0 {
    return true;
  }
  vardef charList = str_to_list(str);
  vardef left = 0;
  vardef right = size(charList) - 1;
  while left < right {
    if charList[left] != charList[right] {
      return false;
    }
    left = left + 1;
    right = right - 1;
  }
  return true;
}
vardef result = isPalindrome(str = "top pot");
print result;
result = isPalindrome(str = "to pot");
print result;