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Warmup-2 > stringX
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Given a string, return a version where all the "x" have been removed. Except an "x" at the very start or end should not be removed.

stringX("xxHxix") → "xHix"
stringX("abxxxcd") → "abcd"
stringX("xabxxxcdx") → "xabcdx"

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public String stringX(String str) { }


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