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Recursion-1 > changeXY
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Given a string, compute recursively (no loops) a new string where all the lowercase 'x' chars have been changed to 'y' chars.


changeXY("codex") → "codey"
changeXY("xxhixx") → "yyhiyy"
changeXY("xhixhix") → "yhiyhiy"

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public String changeXY(String str) { }

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