구조체안의 구조체

typedef struct _user
{
        char user_name[20];
        struct _user *user_next;
}user;
 
typedef struct _channel
{
        int user_count;
        char channel_name[20];
        struct _channel *channel_next;
        user *user_head, *user_tail;
}channel;
channel *channel_head, *channel_tail;
 
void init_user(void)
{
        user_head=(user*)malloc(sizeof(user));
        user_tail=(user*)malloc(sizeof(user));
        user_head->user_next=user_tail;
        user_tail->user_next=user_tail;
}
//이부분에서 channel안의 u_head에 메모리를 할당하고 싶은데 이렇게가 아닌거 같아서요
 
void init_channel(void)
{
        channel_head=(channel*)malloc(sizeof(channel));
        channel_tail=(channel*)malloc(sizeof(channel));
        channel_head->channel_next=channel_tail;
        channel_tail->channel_next=channel_tail;
}