Add buffered producer class

include/cppkafka/utils/compacted_topic_processor.h

@@ -39,7 +39,6 @@
 #include "consumer.h"
 
 namespace cppkafka {
-namespace utils {
 /**
  * \brief Events generated by a CompactedTopicProcessor
  */
@@ -341,7 +340,6 @@ void CompactedTopicProcessor<K, V>::on_assignment(TopicPartitionList& topic_part
     }
 }
 
-} // utils
 } // cppkafka
 
 #endif // CPPKAFKA_COMPACTED_TOPIC_PROCESSOR_H