Feature/prettier

[mykhalenych]

added prettier and updated packages and node.js for gh actions

[mateacademy-ai-mentor]

Review Summary

Great job setting up the project configuration with Prettier and the GitHub Actions workflow! However, this submission requires changes because the core task of writing a comprehensive test suite for the isIsogram function has not been completed.

The current test file only checks if the function is declared, but it needs to verify the function's logic against the specified requirements. Please add tests for the following cases:

• 'playgrounds' should return true
• 'look' should return false
• 'Adam' should return false (case-insensitive)
• '' (an empty string) should return true
• 'Oops' should return false (case-insensitive)

Each of these should be in a separate it block with a clear description inside src/isIsogram.test.js. Looking forward to seeing your updated tests!

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