A constructor that takes the user's ID. If the ID is null, or      * longer than 32 characters, or it does not start with "@",      * throw an IllegalArgumentException.      * The ID may contain any ASCII characters, so you don't have to      * worry about checking for special characters. Also do not worry      * about checking whether any other user has the same ID.      *       * All other instance variables should be initialized appropriately.

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