[WIP] Replace magic numbers with named constants

[Copilot]

• Explore repository structure and understand the codebase
• Fix Java compiler version compatibility issue
• Verify tests are running successfully
• Identify all magic numbers across different language implementations
• Replace magic number 40 (default column width) with named constant
• Replace magic number 2 (decimal precision for prices) with named constant
• Replace magic number 3 (decimal precision for quantities) with named constant
• Replace magic number 1 (quantity comparison threshold) with named constant
• Replace other magic numbers found in formatting logic
• Run tests to verify changes don't break functionality
• Review and validate all changes across all language implementations

Original prompt

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This section details on the original issue you should resolve

<issue_title>Replace magic numbers with named constants</issue_title>
<issue_description>There are several places in the code where "magic numbers" (literal numbers without explanation) are used. Please identify these instances and replace them with appropriately named constants to clarify their meaning.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #21

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