CreateUUId creates a random UUID with from RFC 4122 adapted from http://github.com/nu7hatch/gouuid.

GoChatDir returns the directory of the current project, such as "/home/user/project/gochat*".

Tomorrow returns an object of type time.Time whose value is 00:00:00.000 of the next day.

UserHomeDir returns the home directory of the current user, such as "/home/user" in Unix-like OS.