Write a method that returns the "interlace" of two input parameter strings. The "interlace" of two strings is a string equal in length to the shorter of the two strings, where characters that match in the same position are kept while non-matching characters are replaced with a "-". So if the input strings are "abcd" and "acbdxyz" you would return "a--d". Look at the test data for additional examples. The only string methods you are allowed to use are .equals, .charAt, .substring, and .length.