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Refactor reducer into 'business logic' and 'materializer'

* Business logic ( reducer -> reducer ) implements high-level business rules by ignoring invalid actions and reducing additional actions as needed.
* Materializer simply follows commands (actions) and generates the current state based on those actions.  It is not the materialzer's job to ensure that
* Ensuring that the next state is valid is the job of the business logic, not the materializer.  As such, I have moved the uniqueness constraint from employeeIds.js to existingEmployeesCannotBeHired.js

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