Sync reverse-string

[fejan-malek]

#740

also added missing test cases

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

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[fejan-malek]

@mk-mxp

Need help

I have added 3 new test cases with the below string and it failed.

子猫
Würstchenstand
ผู้เขียนโปรแกรม

I even tried to update the example code with grapheme_extract and mb_substr but still no success tests.

[mk-mxp]

@fejan92 I'm too busy today. Thanks for your patience!

#740

[fejan-malek]

Yeah, no problem.

There is no rush at all.

[mk-mxp]

In canonical-data.json the failing tests are marked with "scenarios": ["unicode"],. In general, adding a scenario to an existing exercise will break too many things. So we only add them when other changes also make students code fail.

[mk-mxp]

Thank you for taking care of this! Again something learned about the inner workings of Exercism - I hope removing the new tests wasn't too frustating.