[XAPID-377] Add method to generate random 4 digit hex a prefix for each file

buffering_manager.go

diff --git a/buffering_manager.go b/buffering_manager.go
index 3acb4c8..ceb011e 100644
--- a/buffering_manager.go
+++ b/buffering_manager.go
@@ -8,7 +8,6 @@
 	"path/filepath"
 	"fmt"
 	"crypto/rand"
-	"encoding/base64"
 	"encoding/json"
 )
 
@@ -119,7 +118,7 @@
 func getRandomHex() string {
 	buff := make([]byte, 2)
 	rand.Read(buff)
-	return base64.URLEncoding.EncodeToString(buff)
+	return fmt.Sprintf("%x", buff)
 }
 
 func createGzipFile(s string) (fileWriter, error) {