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orion.a.smith@gmail.com apcsa-arrays > apcsaArraysConcatThreeStrings
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Given an array of three Strings, return a single String made by concatenating the Strings from the array, in the order of the array elements. 

HINT
You could use a loop, or not. Your choice, since you know the number of array elements beforehand.

apcsaArraysConcatThreeStrings(["a", "b", "c"]) → "abc"
apcsaArraysConcatThreeStrings(["gl", "o", "b"]) → "glob"
apcsaArraysConcatThreeStrings(["a", "ze", "b"]) → "azeb"

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public String apcsaArraysConcatThreeStrings(String[] arr) { }

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