Fixed reverse function

Author: Naveen Venkatesan

payload.go

@@ -252,8 +252,9 @@ func (p *Payload) PackLittleEndian() *big.Int {
 // Reverse byte array for little endian signals.
 func reverse(data []byte) []byte {
 	reversedArray := make([]byte, len(data))
-	for i, j := 0, len(data)-1; i < j; i, j = i+1, j-1 {
-		reversedArray[i], reversedArray[j] = data[j], data[i]
+	copy(reversedArray, data)
+	for i, j := 0, len(reversedArray)-1; i < j; i, j = i+1, j-1 {
+		reversedArray[i], reversedArray[j] = reversedArray[j], reversedArray[i]
 	}
 	return reversedArray
 }