format code
diff --git a/encode.go b/encode.go
index 8522c8d..b0344d1 100644
--- a/encode.go
+++ b/encode.go
@@ -52,7 +52,7 @@
 func (e *Encoder) Clean() {
 	var buffer = make([]byte, 64)
 	e.classInfoList = nil
-	e.buffer =  buffer[:0]
+	e.buffer = buffer[:0]
 	e.refMap = make(map[unsafe.Pointer]_refElem, 7)
 }