C结构体指针访问结构成员

#include <stdio.h>

struct Payload {
    char* title;
    char* data;
};

char* extractData(struct Payload *payload);

int main(int argc, char const *argv[])
{
    struct Payload payload;
    
    payload.title = "content-type";
    payload.data = "text/html";

    char* data = extractData(&payload);
    printf("%s
", data);

    return 0;
}


char* extractData(struct Payload *payload) {
    if (NULL == payload) {
        return 0;
    }
    
    return payload->data;
}