Accept an Interface as a Parameter

The IMessage interface declares string GetText(), and the Hello class already returns Hello from it. Complete the Printer.Format method so it returns the message's text followed by an exclamation mark. Format must accept any IMessage. Do NOT write a Main method.

For a Hello message the program prints the output shown in Expected Output.

Expected Output:

Hello!↵

= newline. The output ends with a newline — print one after the last line.

Hints2 available

Topics:

Interfaces

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Your Output

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