CodingBat combinify

combinify

Given an array of Strings, recursively create a String consisting of all the even-indexed Strings concatenated together, followed by all the odd-indexed Strings. Consider index 0 as even. You will need to write a helper method for this problem.

combinify(["a", "b"]) → "ab"
combinify(["a", "b", "c", "d"]) → "acbd"
combinify([]) → ""

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