bool isPalindrome(char* s) {
char *c = s;
while (*c != '\0') {
c++;
}
int length = c - s;
if (length <= 0) return true;
char *first = s, *last = c - 1;
while (true) {
while (*first != '\0' && !isCh(*first)) first++;
while (!isCh(*last)) last--;
if (first >= last)
break;
char a = *first;
char b = *last;
if (igcase(a) != igcase(b)) {
return false;
} else {
first++;
last--;
}
}
return true;
}
int isAlpha(int c){
// provjerava jeli char alfabetski
return 1-isCh(c);
}