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tmhscs@gmail.com strings > string_changeAB
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Given a String, change all of it's A's to B's and all of its B's to A's.


string_changeAB("bad") → "abd"
string_changeAB("BAD") → "ABD"
string_changeAB("Bad") → "Abd"

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public String string_changeAB(String str) { }

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