Add cache decorator

[Loki-sudo007]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your implementation correctly satisfies all task requirements. The cache decorator properly stores function results, returns cached values for repeated arguments without re-executing the function, prints the required messages, and maintains separate caches for multiple decorated functions using closure. Variable naming is descriptive and double quotes are used throughout the code. The only minor improvement noted is a small redundancy where the else block could be removed since the if branch already returns - the subsequent calculation code could be unindented. However, this is purely cosmetic and does not affect functionality or task completion. No test failures were reported. Your solution is approved and meets all core requirements.

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