added check for invalid emails instead of making remove_invalid_email method does more than one thing (Robert's book 'clean code'). Also removed unnecessary brackets. Need to refactor the main method (it's quite big now)
added check for invalid emails instead of making remove_invalid_email method does more than one thing (Robert's book 'clean code'). Also removed unnecessary brackets. Need to refactor the main method (it's quite big now)

AhmedShab/Catalyst_task