Cây đối xứng

#include <stdio.h>
#include <string.h>
#include "solution.h"

int main() {
    char s[4096];
    if (!fgets(s, sizeof(s), stdin)) s[0] = '\0';
    s[strcspn(s, "\r\n")] = '\0';
    printf("%s\n", isSymmetric(s) ? "true" : "false");
    return 0;
}