feat: adds files for lesson_06 homework and stretch assignment

[emblue252]

This pull request includes the necessary files needed for the homework creating an expression calculator function and the stretch homework that checks if a word has the correct abbreviations.

[anthonydmays]

🎓 Automated Grading Report

Student: Evander Blue
Date: 8/21/2025

Feedback

Evander Blue's submission meets all the functional requirements for the calculate method in expression_calculator.ts. The method correctly implements the calculation using the provided helper functions for addition, subtraction, multiplication, division, and exponentiation. The .env.test file was correctly configured with the assigned group letter 'B', ensuring compliance with the assignment requirements.

Technically, the code is well-structured and adheres to TypeScript standards. The implementation is clean, with consistent style and proper use of TypeScript features. All GitHub checks have passed, indicating that the code is free of syntax errors and follows the project's linting rules.

For the stretch assignment, the student implemented the validAbbreviation function in JavaScript, which correctly interprets the alphabetic abbreviation system. The function handles the conversion of letters to numbers and checks for valid abbreviation conditions. However, the implementation is in JavaScript instead of TypeScript, which slightly detracts from the technical consistency expected in the stretch requirements. Additionally, the function could benefit from further testing to ensure robustness across various edge cases.

Overall, the submission is strong, with minor improvements needed in the stretch assignment to fully meet all criteria.

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This is an automated preliminary review. Please review and adjust before finalizing.