NOTE: This problem has restrictions regarding what string methods you are allowed to use. The ONLY string methods you are allowed to use are: .length, .substring, .charAt, and .equals. You may NOT use any other string methods. Preconditions: 'orig' contains a string of any length. 'remove' contains a string with a single character in it. 'replace' contains a string of any length. Write a method that returns a new string based on the string 'orig'. The new string has every instance of 'remove' removed and replaced with 'replace'. Remember that 'remove' will be a single character, but 'replace' can be any length (including length zero). Look at the test data for examples.