refactor code

src/main/java/com/peanut/modules/book/vo/ExpressCompanyVo.java

@@ -0,0 +1,20 @@
+package com.peanut.modules.book.vo;
+
+import lombok.Data;
+
+/**
+ * @Description: 快递公司 Vo
+ * @Author: Cauchy
+ * @CreateTime: 2023/10/16
+ */
+@Data
+public class ExpressCompanyVo {
+    /**
+     * 快递公司名称
+     */
+    private String expressName;
+    /**
+     * 快递公司编码
+     */
+    private String expressCode;
+}