Intuition:
The problem asks us to check whether a given string S can be transformed int the another string GOAL by rotating the string by rotating the characters of string S.
By concatenating the same string S, we create a single master string that has has all the possible combinations of the given string and using the built-in methods, we can check whether the desired GOAL is a part of that master string or not and return the result based on that.
It is similar to how we rotate an array. But strings work differently so that allows us to concatenate them and check for specific sub-strings that we need.
