Deduplicate - string case unification

[hobovsky]

From #39

1. Fix string case

• 7kyu
• Tie-breaking rule: make string lowercase
• Satisfaction 94% with 23k completions
• 1 pending issue
• 21 languages, no pending translations
• Published Jun 2018, author active

2. Simple Fun #262: Case Unification

• 7kyu
• No inputs which would result in a tie
• Satisfaction 91% with 700+ completions
• No pending issues
• 3 languages, no pending translations, all covered by kata 1.
• Published May 2017, author active-ish

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Conclusion

• Keep 1. Fix string case
• Retire 2. Simple Fun #262: Case Unification

[hobovsky]

I think that amount of translations and possibility of ties make the kata 1. worth keeping, and kata 2. unnecessary.

[CiprianAmza]

Keep only 1, it has more translations.