. A tandem repeat of a base string b within a string s is a substring of s consisting of at least one consecutive copy of the base string b. Given b and s, design an algorithm to find a tandem repeat of b within s of maximum length. For example, if s is "abcabcababcaba" and b is "abcab", then "abcababcab" is the tandem substring of maximum length (2 copies). Your answer will be graded on correctness, efficiency, clarity Let M denote the length of b and let N denote the length of s. For full points, your algorithm should take time proportional to M + N.