修复返回path不是相对prefix的

src/main/java/com/ycwl/basic/storage/utils/StorageUtil.java

@@ -38,4 +38,14 @@ public class StorageUtil {
         }
         return name;
     }
+
+    public static String getRelativePath(String fullPath, String relativeOn) {
+        if (StringUtils.isBlank(relativeOn)) {
+            fullPath = fullPath.replace(relativeOn, "");
+        }
+        if (fullPath.startsWith("/")) {
+            fullPath = fullPath.substring(1);
+        }
+        return fullPath;
+    }
 }