修复预交金bug,充值失败会补偿处理

src/main/java/com/guahao/common/util/AmountUtil.java

@@ -68,4 +68,8 @@ public final class AmountUtil {
         BigDecimal amountB = parseAmount(b, BigDecimal.ZERO);
         return amountA.compareTo(amountB);
     }
+    // Double金额转为String金额
+    public static String doubleToStr(Double amount) {
+        return String.format("%.2f", amount);
+    }
 }