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For an event, you keep a list of names (strings). Start empty.
Repeatedly ask for a name until the user types done (lowercase is fine). If the name is already in the list, print a message like Already signed up and do not add it again. Otherwise append it.
At the end, print the full list of unique names, one per line.
Skills: in with lists, append, loops.
Hint: if name not in names_list: