This SetUtil class tests various usages of the Set class. 
param1 is a string. You will create a set with all vowels, a,e,i,o,u. Then you will return 
string with all vowels removed. Vowels may be lower or upper case.

Complete the following file:

SetUtil.java

import java.util.Set; import java.util.HashSet; /** This SetUtil class tests various usages of the Set class. param1 is a string. You will create a set with all vowels, a,e,i,o,u. Then you will return string with all vowels removed. Vowels may be lower or upper case. */ public class SetUtil { public static String check(String str) { // TODO Create a stack of Character elements, caled stack, with all possible vowels return processSet(stack, str); } public static String processSet(Set<Character> set, String str) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < str.length(); i++) { // TODO: if a string char is in the set do nothing, otherwise append it // to the stringbuffer, sb } return sb.toString(); } }