write the function getkthdigit(n, k) that takes a possibly-negative int n and a non-negative int k, and returns the kth digit of n, starting from 0, counting from the right. so
a. getKthDigit(789, 0) 9 b. getKthDigit(789, 1) c. getKthDigit(789, 2) 7 d. get thDigit(789, 3) - e. get thDigit(-789, ) - 9