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Message Filter
Textio is introducing a feature that allows users to filter their messages based on specific criteria. For this feature, messages are categorized into three types: TextMessage, MediaMessage, and LinkMessage. Users can filter their messages to view only the types they are interested in.
Assignment
Your task is to implement a function that filters a slice of messages based on the message type.
Complete the filterMessages function. It should take a slice of Message interfaces and a string indicating the desired type ("text", "media", or "link"). It should return a new slice of Message interfaces containing only messages of the specified type.