Hi, I'mKhemraj Sharma

// Bad approach - Violation of Single Responsibility
class UserManager {
    fun authenticateUser(username: String, password: String): Boolean {
        // Database operations, validation, token generation all in one place
        return true
    }
}

// Clean approach - Following Single Responsibility
class UserAuthenticator(private val repository: UserRepository) {
    fun authenticate(credentials: Credentials): AuthResult {
        return repository.findByUsername(credentials.username)?.let { user ->
            if (passwordHasher.verify(credentials.password, user.passwordHash)) {
                AuthResult.Success(tokenGenerator.generateFor(user))
            } else {
                AuthResult.Failed(AuthError.INVALID_CREDENTIALS)
            }
        } ?: AuthResult.Failed(AuthError.USER_NOT_FOUND)
    }
}