Write a method that gets the last n characters from a string. For example, last("Hello, World!", 5) should return the string "orld!".

Complete the following file:

Strings.java

public class Strings { /** Gets the last n characters from a string. @param s a string @param n a nonnegative integer <= s.length() @return the string that contains the last n characters of s */ public String last(String s, int n) { // your work here } }