Write a method that takes a string as a parmeter and returns the reversal of that string as a return type. // "hello, world" -> "dlrow ,olleh" // "test" -> "tset"

3. Write a method that takes two collections of characters as a parameters and returns a new Set of distinct elements common between the two collections. // Give me the intersection of common elements between two data sets. // ['a', 'a', 'c', 'd'], ['a', 'c'] // -> ['a', 'c'] // ['a', 'a', 'c', 'd'], ['a', 'a', 'c'] // -> ['a','c']