文字列の最初と最後の文字をつなげて返すような関数を作成しましょう。 もし文字が一つしかない場合、その文字は最初と最後の文字のため、関数はその文字を二回返すようにしておきましょう。
例:
stringfirstandlast('boring example') = 'be'- (英語版) Problem 649. Return the first and last character of a string https://www.mathworks.com/matlabcentral/cody/problems/649
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