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Functional-1 > moreY
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Given a list of strings, return a list where each string has "y" added at its start and end.

moreY(["a", "b", "c"]) → ["yay", "yby", "ycy"]
moreY(["hello", "there"]) → ["yhelloy", "ytherey"]
moreY(["yay"]) → ["yyayy"]

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public List<String> moreY(List<String> strings) { }

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