Given two strings s and t of equal length, the Hamming distance between s and t, denoted dH(s,t), is the number of corresponding
symbols that differ in s and t. Given: Two DNA strings s and t of equal length (not exceeding 1 kbp).
Return: The Hamming distance dH(s,t).
Sample Dataset
GAGCCTACTAACGGGAT CATCGTAATGACGGCCT
Sample Output
7
