pub unsafe extern "C" fn rd_kafka_conf_set_rebalance_cb(
    conf: *mut rd_kafka_conf_t,
    rebalance_cb: Option<unsafe extern "C" fn(rk: *mut rd_kafka_t, err: rd_kafka_resp_err_t, partitions: *mut rd_kafka_topic_partition_list_t, opaque: *mut c_void)>
)