static void send_client_tracking(redisContext *c, const char *str) {
    redisReply *reply;

    reply = redisCommand(c, "CLIENT TRACKING %s", str);
    assert(reply != NULL && reply->type == REDIS_REPLY_STATUS);
    freeReplyObject(reply);
}
static void send_client_tracking(redisContext *c, const char *str) {
    redisReply *reply;

    reply = redisCommand(c, "CLIENT TRACKING %s", str);
    assert(reply != NULL && reply->type == REDIS_REPLY_STATUS);
    freeReplyObject(reply);
}