pub unsafe extern "C" fn rd_kafka_consumer_group_metadata_write(
cgmd: *const rd_kafka_consumer_group_metadata_t,
bufferp: *mut *mut c_void,
sizep: *mut size_t
) -> *mut rd_kafka_error_t
pub unsafe extern "C" fn rd_kafka_consumer_group_metadata_write(
cgmd: *const rd_kafka_consumer_group_metadata_t,
bufferp: *mut *mut c_void,
sizep: *mut size_t
) -> *mut rd_kafka_error_t