硬编码文件分隔符

https://github.com/alibaba/DataX/blob/05a000db446aa8185191824f6d56fa1c131aeb79/core/src/main/java/com/alibaba/datax/core/container/util/HookInvoker.java#L88
应用程序需要在不同的平台上运行时，使用硬编码文件分隔符会导致应用程序逻辑执行错误,应使用语言库提供的独立于平台的API，如java.io.File.separator，也可以通过使用java.lang.System.getProperty("file.separator")来获取。

Open core/src/main/java/com/alibaba/datax/core/container/util/HookInvoker.java at line 88 and inspect the hard-coded file separator. Replace the platform-specific usage with the Java platform-independent API requested in the issue, then verify that the application logic remains correct across operating systems.

Written by the indexing model from the issue text.