Problem Statement Someone has encrypted your computer. Being the super genius you are, you find a string of characters that can help you break the code. Given a String of characters, find the longest substring of consecutive letters, if you can do that...maybe you will be able to get your computer back... Promise Length of the string is at most 20 characters Input Format String of AlphaNumeric characters Output Format Longest substring of common characters Sample Input AABAABBBCCBAAAAC Sample Outpu t AAAA Explanation The longest substring in the given string is AAAA Write in Java code Please