J.R.R. Tolkien has decider to re-write The Hobbit. He needs your help! He has decided to replace the "ring" with the "pacifier". Write a method that accepts an input string and returns a new version of that string with each occurance of the word "ring" replaced with the word "pacifier". You may assume that the input string will have no capital letters. The only problem is that Mr. Tolkien will only let you use four string methods: length, substring, equals, and charAt. So those are the only string methods you can use in your program. You can use string operations such as assignments and concatenation, but no other string methods! Of course you can use conditionals and loops as much as you want.