add abstract class Machine and its subclasses

[zibi-dev]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your implementation successfully fulfills all core OOP requirements. The abstract Machine class with its two abstract methods is correctly defined, all three subclasses (Truck, Bulldozer, Excavator) properly extend it with informative English messages, and MainApp demonstrates correct polymorphism using a Machine[] array. The functional implementation is solid and meets all task specifications. While there are some empty line formatting issues mentioned (redundant lines after package declarations and between methods), these are cosmetic whitespace concerns rather than critical blockers—the code works correctly. You may want to run your linter to clean up the formatting, but the solution is approved.

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[mateacademy-ai-mentor]

Redundant empty line between abstract method declarations. Remove it.

[mateacademy-ai-mentor]

Redundant empty line after array initialization. Remove it.

[mateacademy-ai-mentor]

Redundant empty line after package declaration. Per checklist: avoid empty lines after class declaration or method signature.

[mateacademy-ai-mentor]

Redundant empty line after package declaration. Per checklist: avoid empty lines after class declaration or method signature.

[mateacademy-ai-mentor]

Redundant empty line after package declaration. Per checklist: avoid empty lines after class declaration or method signature.

[mateacademy-ai-mentor]

Redundant empty line after package declaration. Per checklist: remove empty lines after class declaration or method signature.

[mateacademy-ai-mentor]

Redundant empty line between methods. Per checklist: remove empty lines after method signature.