From a5e2df69422ba2f318fdf14af048065897c7f6ef Mon Sep 17 00:00:00 2001
From: Anastasia Prasolova <a-prasolova1507@yandex.ru>
Date: Thu, 7 Feb 2019 14:44:51 +0300
Subject: [PATCH] small fix of utxo calculation on raw transaction build (#126)

* small fixes

* gofmt

* fix in raw tx build

* fixes after review
---
 pkg/rpc/txBuilder.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pkg/rpc/txBuilder.go b/pkg/rpc/txBuilder.go
index 1f4b001d8..1d7f4dc46 100644
--- a/pkg/rpc/txBuilder.go
+++ b/pkg/rpc/txBuilder.go
@@ -48,8 +48,10 @@ func CreateRawContractTransaction(params ContractTxParams) (*transaction.Transac
 		tx.AddInput(&input)
 	}
 
-	senderOutput = transaction.NewOutput(assetID, spent-amount, fromAddressHash)
-	tx.AddOutput(senderOutput)
+	if senderUnspent := spent - amount; senderUnspent > 0 {
+		senderOutput = transaction.NewOutput(assetID, senderUnspent, fromAddressHash)
+		tx.AddOutput(senderOutput)
+	}
 	receiverOutput = transaction.NewOutput(assetID, amount, toAddressHash)
 	tx.AddOutput(receiverOutput)