如何将可变数据传递到 libcurl 帖子正文中？

如何解决如何将可变数据传递到 libcurl 帖子正文中？

我在使用 libcurl 时将变量的值传递到 POST Body 时遇到问题。这是我的代码：

#include "curl/curl.h"

char *fullname ="morpheus";
char *role = "leader";

CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl,CURLOPT_CUSTomrEQUEST,"POST");
  curl_easy_setopt(curl,CURLOPT_URL,"https://reqres.in/api/users");
  curl_easy_setopt(curl,CURLOPT_FOLLOWLOCATION,1L);
  curl_easy_setopt(curl,CURLOPT_DEFAULT_PROTOCOL,"https");
  struct curl_slist *headers = NULL;
  headers = curl_slist_append(headers,"Content-Type: text/json");
  curl_easy_setopt(curl,CURLOPT_HTTPHEADER,headers);
  const char *data = "{\"name\": \"${fullname}\",\"job\":\"${role}\"}";
  curl_easy_setopt(curl,CURLOPT_POSTFIELDS,data);
  curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,function_pt);
  res = curl_easy_perform(curl);
}
curl_easy_cleanup(curl);