Write a method that returns the input parameter 'str' but with all E's and Z's removed. Remove both upper- and lower-case E's and Z's. The ONLY String methods you may use are: .length, .charAt, .substring, .equals, and .compareTo. You do not need to use all of these methods! Of course you can use all the normal non-String Java commands as needed. If there are no E's or Z's in the 'str' String, then you simply return that String unchanged.