add task solution

[RomanPlyta]

No description provided.

[mateacademy-ai-mentor]

Review Summary

I am approving your solution because the tests for restoreNames thoroughly cover all the required behaviors and align well with the task description. You correctly verify that the function is declared, updates firstName when it is missing or undefined, and leaves existing firstName values untouched. The tests also confirm that the function works in-place (mutating the input array of users) and that it does not return a meaningful value, which matches the specified requirements. Handling multiple users in the input and deriving firstName from the first part of fullName are both tested appropriately with clear Jest expectations. Overall, your test file demonstrates good coverage, correct use of Jest, and solid adherence to the project requirements. Nicely done—this implementation is ready to move forward.

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