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pais@kinetigram.com > R116_changeXY
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APCS Recursion 1, Problem 16. Given a string, compute recursively (no loops) a new string where all the lowercase 'x' chars have been changed to 'y' chars.


R116_changeXY("codex") → "codey"
R116_changeXY("xxhixx") → "yyhiyy"
R116_changeXY("xhixhix") → "yhiyhiy"

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public String R116_changeXY(String str) { }

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