🧠 Build a Prolog Expert System for Diagnosing Common Cold vs Flu

### 🧠 Prolog Expert System: Cold vs Flu

Create a rule-based system in Prolog to diagnose whether a patient is more likely to have a **common cold** or **influenza**, based on symptoms like:

- Fever
- Body aches
- Runny nose
- Cough
- Fatigue

📁 File to be created:
```

src/06_expert_system/cold_vs_flu.pl

```

Use `ask()` style user interaction or assert predicates. Document your rules with comments.

Create src/06_expert_system/cold_vs_flu.pl and start by reviewing the issue's required symptoms and interaction options. Implement a rule-based distinction between common cold and influenza using ask() style interaction or asserted predicates, with comments explaining the rules. Done means the file runs and can diagnose the two conditions from the listed symptoms.

Written by the indexing model from the issue text.