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You are given two integer numbers, the base a and the index b. You have to find the last digit of ab.
a = "3", b = "10"
310 = 59049. Last digit is 9.
a = "6", b = "2"
62 = 36. Last digit is 6.
You don't need to read input or print anything. Your task is to complete the function getLastDigit() which takes an Strings a, and b as input and returns the answer.
Expected Time Complexity: O(|b|)
Expected Auxiliary Space: O(1)
1 <= |a|,|b| <= 1000
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