Refactors legacy code to modern patterns while preserving functionality
Output: Refactored code with detailed migration guide. Context: {{LANGUAGE}} legacy code targeting {{TARGET_VERSION}}, constraints: {{CONSTRAINTS}}. Task: Modernize this legacy code: {{LEGACY_CODE}}. Constraints: Do NOT break functionality. Do NOT remove required behavior. Do NOT ignore performance improvements. Apply modern {{LANGUAGE}} patterns and best practices. Include explanation of changes.
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Rewritten code using modern language constructs, separation of concerns, and applied design patterns. Comparison of old and new approaches with explanation of benefits.
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