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String-1 > withoutX2
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Given a string, if one or both of the first 2 chars is 'x', return the string without those 'x' chars, and otherwise return the string unchanged. This is a little harder than it looks.

withoutX2("xHi") → "Hi"
withoutX2("Hxi") → "Hi"
withoutX2("Hi") → "Hi"

...Save, Compile, Run (ctrl-enter)

public String withoutX2(String str) { }

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