怎么用c语言爬虫

#include CURL *curl;CURLcode res;char *buffer;long response_code;int main() {    // 创建 HTTP 请求    curl = curl_easy_init();    curl_easy_setopt(curl, CURLOPT_URL, "https://www.google.com");    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, NULL);    // 执行请求    res = curl_easy_perform(curl);    // 获取响应代码    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);    // 解析响应    if (res == CURLE_OK && response_code == 200) {        // 分配缓冲区        buffer = malloc(1024);        // 存储响应主体        curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &buffer);        // 提取标题        char *start_tag = strstr(buffer, "");        if (start_tag != NULL && end_tag != NULL) {            printf("%sn", start_tag + strlen("