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Check the exam
The first input array contains the correct answers to an exam, like
["a", "a", "b", "d"]. The second one is “answers” array and contains
student’s answers.
The two arrays are not empty and are the same length. Return the score for this array of answers, giving +4 for each correct answer, -1 for each incorrect answer, and +0 for each blank answer(empty string).
If the score < 0, return 0.
For example:
> checkExam(["a", "a", "b", "b"], ["a", "c", "b", "d"]) → 6
> checkExam(["a", "a", "c", "b"], ["a", "a", "b", ""]) → 7
> checkExam(["a", "a", "b", "c"], ["a", "a", "b", "c"]) → 16
> checkExam(["b", "c", "b", "a"], ["", "a", "a", "c"]) → 0