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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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the upper & lower different is 32=0010 0000
'A' ^ 'a' wanna get this value
c|= 0010 0000 will let upper trans to lower
that's why next line only compare the lower vowel.
Done. Thanks for the suggestion.
First, you can make your code look good in comments using markdown formatting
Regarding your code, while I do agree that 6kyu is a bit low for this kata, it's not a 'math problem' requiring a 'formula' at all. In fact, at a glance your approach is valid, and you should consider ways it could be made faster.
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