fix: directory separator from routing file.

[ping-yee]

Description
Fixes #7474

Normalize the route path.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[lonnieezell]

Have you checked this on Windows and verified that realpath() will actually solve the problem?

[ping-yee]

Have you checked this on Windows and verified that realpath() will actually solve the problem?

Yep, I can pass the test cases on Windows (Linux also) with using realpath() to normalize the route path.

[ping-yee]

In Windows, the route path will be:

D:\project\github\CodeIgniter4\app\Config/Routes.php <= before handle normalize work with realpath()

D:\project\github\CodeIgniter4\app\Config\Routes.php <= after handled with realpath()

In Linux, the route path will not be changed after handled by realpath():

/mnt/d/project/github/CodeIgniter4/app/Config/Routes.php

@lonnieezell

[kenjis]

Thank you!