參考資料:
http://stackoverflow.com/questions/24092884/get-nth-character-of-a-string-in-swift-programming-language
http://stackoverflow.com/questions/24095247/convert-unichar-to-string
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參考資料:
http://stackoverflow.com/questions/24092884/get-nth-character-of-a-string-in-swift-programming-language
http://stackoverflow.com/questions/24095247/convert-unichar-to-string
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