remove unnecessary code

common/serial/interface.go

@@ -1,9 +0,0 @@
-package serial
-
-import (
-	"fmt"
-)
-
-func PointerToString(value interface{}) string {
-	return fmt.Sprint(value)
-}

testing/assert/pointer.go

@@ -10,7 +10,7 @@ func (v *Assert) Pointer(value interface{}) *PointerSubject {
 	return &PointerSubject{
 		Subject: Subject{
 			a:    v,
-			disp: serial.PointerToString(value),
+			disp: serial.ToString(value),
 		},
 		value: value,
 	}