update openssl, do not work hmac - c++

Question

there is code
#include <stdio.h>
#include <string.h>
#include <openssl/hmac.h>
int main() {
const char key[] = "012345678";
char data[] = "hello world";
unsigned char* result;
unsigned int len = 20;
result = (unsigned char*)malloc(sizeof(char) * len);
HMAC_CTX ctx;
HMAC_CTX_init(&ctx);
HMAC_Init_ex(&ctx, key, strlen(key), EVP_sha1(), NULL);
HMAC_Update(&ctx, (unsigned char*)&data, strlen(data));
HMAC_Final(&ctx, result, &len);
HMAC_CTX_cleanup(&ctx);
printf("HMAC digest: ");
for (int i = 0; i != len; i++)
printf("%02x", (unsigned int)result[i]);
printf("\n");
free(result);
}
output HMAC digest: e19e220122b37b708bfb95aca2577905acabf0c0
I can not update this code for openssl 1.1.0.
The new version changed the syntax hmac.
#include <iostream>
#include <string.h>
#include <openssl/hmac.h>
using namespace std;
int main() {
const char key[] = "012345678";
char data[] = "hello world";
int datalen = strlen(data);
int keylen = strlen(key);
unsigned char* result;
unsigned int len = 20;
result = (unsigned char*)malloc(sizeof(char) * len);
cout << datalen << endl;
cout << keylen << endl;
cout << len << endl;
HMAC_CTX *HMAC_CTX_new();
int HMAC_CTX_reset(HMAC_CTX *ctx);
int HMAC_Init_ex(HMAC_CTX *ctx, const char key, int keylen, const EVP_MD EVP_sha1());
int HMAC_Update(HMAC_CTX * ctx, char &data, int datalen);
int HMAC_Final(HMAC_CTX * ctx, char result, int &len);
int HMAC_CTX_cleanup(HMAC_CTX * ctx);
printf("HMAC digest: ");
for (int i = 0; i != len; i++)
printf("%02x", (unsigned int)result[i]);
printf("\n");
free(result);
return 0;
}
output HMAC digest: 0000000000000000000000000000000000000000
I will be glad of any help