Remove single quotes in #gu3 Backslash within double quotes

[andy1li]

Before:

The single quotes are not testing "backslash within double quotes" at all.

---

After:

Note

Use %q to quote file paths for the custom cat command in testQ5 instead of manual single quotes.

• Tests (internal/stage_q5.go):
  • Update inputs construction in testQ5 to use Go %q for quoting file paths when invoking CUSTOM_CAT_COMMAND, replacing manual single-quoting.
  • Keeps expected outputs unchanged; only command construction is adjusted.

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[github-actions]

Triggered a Github Actions job to update fixtures.

[github-actions]

Triggered a Github Actions job to update fixtures.