refactor by popmac #17
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2行目では、splitメソッドの引数を省略して、mapメソッドで&:のイディオムを使用。 3行目では、行と列の入れ替えのためにArray#transposeを使用。
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主旨
transportメソッドの変更内容
&:のイディオムを使用するようにしました&:のイディオムが使用できるようになりました