Strings Concept Exercise Re-Write

[BethanyG]

Renamed exercises from processing-logs to little-sisters-vocab
Added <str>.join(), <>.split(), string indexes, and string slices to the exercise.

• Edited config.json for exercise rename.
• Rewrote introduction.md
• Rewrote instructions.md
• Rewrote hints.md
• Rewrote exemplar.py
• Rewrote strings_test.py
• Added docstrings to strings.py
• Edited /.meta/links.json file
• Added exercise icon to .meta/config.json file
• Formatted .meta/config.json file

[neenjaw]

In the spirit of optimistic merging, I think this is quite good. There are a few changes I would suggest to wording/grammar. Nice work @BethanyG!!

[neenjaw]

@exercism/reviewers was pinged to this, so I assumed could approve it, but 🤷🏻 (@iHiD)

[SleeplessByte]

You can. It's approved now

[BethanyG]

@SleeplessByte -- it's not. At least, I am not seeing it. I am seeing the below. So I think the codeowners file needs to be changed, or permissions need to be re-jiggered??.:

[SleeplessByte]

Ah yes. A python member needs to approve it!

[SleeplessByte]

https://github.com/orgs/exercism/teams/python/members

@exercism/python We need you!

[iHiD]

I've removed the codeowners restriction. It doesn't really make much sense to have it there as this should be managed by GH teams. I'd suggest only having it on specific things you want to ensure have two track-maintainers agree on something, for example workflows on the Javascript track.

I've also removed it on the Tooling repos, which had you and Corey hard-coded as having to sign off each others work.