Mastering Kotlin Essentials/

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Exercise: User Authentication

Exercise: User Authentication

Enhance your Kotlin skills by implementing a structured approach for managing user authentication results.

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Problem statement

Implement a sealed class hierarchy to represent the result of user authentication operations. The AuthResult class can have two subclasses: AuthSuccess and AuthFailure. Additionally, introduce nullable types and use the Elvis operator to handle potential null values in the process.

Here is the provided class hierarchy:

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sealed class AuthResult {
    // TODO: Implement AuthSuccess data class
    // Represents a successful authentication result with a non-null username.
    // TODO: Implement AuthFailure data class
    // Represents a failed authentication result with a non-null errorMessage.
}

Your task is to implement the AuthSuccess and ...