You should be able to initialize with a list of email addresses either separated with spaces or separated with commas. The parse method should, additionally, only return unique addresses.
Instructions
This lab is test-driven, so run the test suite to get started and use the test output to get the program working.
Hints:
How will you control for parsing a list of email addresses that is either comma separated or separated by a white space?
Use an attr_accessor to set and get the list of email addresses