✨ [Feature] Optimize the backslash when using facades.Route().Prefix("/product")

[hwbrzzl]

Before feedback (在反馈之前)

• There are no features that I want to submit in Issues (当前 Issues 中没有我将要提交的新功能)

Describe Feature (描述功能)

In the case below:

facades.Route().Prefix("/product").Group(func(router route.Router) {
  router.Get("", func()...)
  router.Get("/{code}", func()...)
})

The first URL will be /product/, it's expected to change to /product.

[github-actions]

Hi @hwbrzzl 👋

We think your feedback is very valuable! If you are interested, please submit a PR, please include test cases, documentation, etc., and ensure that the CI is passed, thank you and look forward to your contribution!
我们认为您的反馈非常有价值！如果有兴趣欢迎提交 PR，请包含相应的测试用例、文档等，并确保 CI 通过，感谢和期待您的贡献！