CodingBat konstans@stuy.edu deleteDuplicates

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Given an ArrayList of strings, remove any string that occurs at a previous index of the ArrayList.

deleteDuplicates(["a", "a", "a", "a", "b", "a", "c", "b"]) → ["a", "b", "c"]
deleteDuplicates(["c", "a", "a", "a", "a", "f", "b", "a", "c", "b"]) → ["c", "a", "f", "b"]
deleteDuplicates(["a", "a", "a", "a", "a", "a"]) → ["a"]

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