exercise2

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Overview

Create a custom error type called appError that contains three fields, Err error, Message string and Code int. Implement the error interface providing your own message using these three fields. Write a function called checkFlag that accepts a bool value. If the value is false, return a pointer of your custom error type initialized as you like. If the value is true, return a default error. Write a main function to call the checkFlag function and check the error for the concrete type.