add task solution

[ElisabethPO]

No description provided.

[mateacademy-ai-mentor]

Review Summary

I am approving your solution because all core functional requirements are met: isIsogram behaves correctly for all specified cases (including case-insensitivity and the empty string) and your tests cover the required example inputs. The remaining points are about test clarity rather than broken behavior. Specifically, in src/isIsogram.test.js, you have an it('is case-insensitive', ...) block that asserts both isIsogram('Adam') and isIsogram('Oops'), which violates the requirement that each test have a clear, single purpose; splitting this into two it blocks will produce better, more focused failures. Also, the test description about the empty string (should be an empty line) is ambiguous; renaming it to something like returns true for empty string will make the intent explicit and align with the requirement to treat '' as an isogram. These are non-blocking quality improvements, but they are worth applying to strengthen your test suite and make your work easier to maintain and grade. Overall, your implementation is correct and well-aligned with the task, with only minor test-description polish suggested.

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[mateacademy-ai-mentor]

This test block it('is case-insensitive', ...) contains two expectations (isIsogram('Adam') and isIsogram('Oops')). Per the requirement that each test case has a clear and unique description, split these into separate it blocks (for example: it('returns false for "Adam" (case-insensitive)') and it('returns false for "Oops"')) so each test verifies a single behavior.

[mateacademy-ai-mentor]

The description should be an empty line is unclear about expected behavior. Rename it to something explicit like returns true for empty string to clearly state the assertion being made (the task requires treating the empty string as an isogram).