Friend Group Identifier

You need to identify groups of friends based on their names. The input consists of names, where each name is followed by a list of names who they consider friends, all on the same line. The end of input is indicated by an empty line. You should output each name and their unique group of friends. Example input: Alice: Bob, Charlie Bob: Alice, David Charlie: Alice Output should format each person and their friends: Alice: Bob, Charlie Bob: Alice, David Charlie: Alice