Nest packages under pkg

pkg/observers/blockchain_db_observer.go

@@ -0,0 +1,18 @@
+package observers
+
+import (
+	"github.com/8thlight/vulcanizedb/pkg/core"
+	"github.com/8thlight/vulcanizedb/pkg/repositories"
+)
+
+type BlockchainDbObserver struct {
+	repository repositories.Repository
+}
+
+func NewBlockchainDbObserver(repository repositories.Repository) BlockchainDbObserver {
+	return BlockchainDbObserver{repository: repository}
+}
+
+func (observer BlockchainDbObserver) NotifyBlockAdded(block core.Block) {
+	observer.repository.CreateBlock(block)
+}