Pre-order Traversal

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

int main() {
    char buf[4096];
    if (!fgets(buf, sizeof(buf), stdin)) buf[0] = '\0';
    buf[strcspn(buf, "\r\n")] = '\0';
    BinaryTree bt;
    BinaryTree_init(&bt);
    BinaryTree_buildTree(&bt, buf);
    BinaryTree_preOrderPrint(&bt);
    return 0;
}