fix barcode generator

@@ -638,6 +638,11 @@ import AVFoundation
             var result = 0;
             
             var fixedCouponCode = couponString;
+            
+            if (fixedCouponCode.count == 13) {
+                return fixedCouponCode;
+            }
+            
             if (fixedCouponCode.count < 12) {
                 let loops = 12 - fixedCouponCode.count;
                 var zerosStr = "";