Can you explain what the Anti-Corruption Layer pattern is and why it is needed in system architecture?

The Anti-Corruption Layer (ACL) pattern is used to isolate one system or subsystem from the influence of another, especially if they have different data models, business rules, or architectural styles.

Why ACL is needed:

• Prevents "corruption" of the internal system model by external concepts and structures.
• Allows integration of external systems without direct impact on internal logic.
• Ensures data adaptation and transformation between systems.

In Go, this can be implemented through a separate package or layer responsible for data transformation and calls to external services, providing the internal code with a clean and understandable interface.

Example: if you have an internal user model and an external service returns data in a different format, ACL transforms this data into your model, preventing external changes from directly affecting internal logic.