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1: Structs in Go
incomplete
2: Nested Structs in Go
incomplete
3: Anonymous Structs in Go
incomplete
4: Embedded Structs
incomplete
5: Struct Methods in Go
incomplete
6: Memory Layout
incomplete
7: Empty Struct
incomplete
8: Empty Struct
incomplete
9: Update Users
incomplete
10: Send Message
incomplete
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Create a SendMessage method for the User struct.
It should take a message string and messageLength int as inputs.
If the messageLength is within the user's MessageCharLimit, return the original message and true (indicating the message can be sent), otherwise, return an empty string and false.