Use printf in template

postgres/conn.go

@@ -44,11 +44,6 @@ func (tx Transaction) GetAmount() float64 {
 	return amount
 }
 
-func (tx Transaction) GetAmountString() string {
-	amount := tx.GetAmount()
-	return fmt.Sprintf("%.2f", amount)
-}
-
 func (tx Transaction) GetPositive() bool {
 	amount := tx.GetAmount()
 	return amount >= 0