Modify the findsimplegene method to work with dna strings that are either all uppercase letters such as "atgggttaagtc" or all lowercase letters such as "gatgctataat". calling findsimplegene with "atgggttaagtc" should return the answer with uppercase letters, the gene "atgggttaa", and calling findsimplegene with "gatgctataat" should return the answer with lowercase letters, the gene "atgctataa". hint: there are two string methods touppercase() and if dna is the string "atgtaa" then dna. tolowercase() results in the string "atgtaa".