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simona1@sfusd.edu googlebillboard > firstHalf
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Given a string of even length, return the first half. So the string "WooHoo" yields "Woo".


firstHalf("WooHoo") → "Woo"
firstHalf("HelloThere") → "Hello"
firstHalf("abcdef") → "abc"

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public String firstHalf(String str) { }

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