Feature/prettier

[mykhalenych]

added prettier and updated packages

[mateacademy-ai-mentor]

Review Summary

This submission requires changes because the primary task of implementing tests for the reduce function has not been completed. The file src/reduce.test.js contains the initial boilerplate but is missing the actual test cases.

To move forward, please add a comprehensive test suite that covers the required scenarios, such as:

• Summing numbers in an array.
• Using an initial value.
• Handling an empty array (with and without an initial value).
• Flattening an array of arrays.

Once these tests are implemented, I'll be happy to review your work again!

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[mateacademy-ai-mentor]

This is a placeholder test. The goal of this task is to write a comprehensive test suite for the reduce function. Please add tests that cover various scenarios, such as:

• Summing up numbers in an array.
• Using an initial value.
• Handling an empty array (with and without an initial value).
• Concatenating strings or flattening an array of arrays.