"""Create reasoning_engine
Generated by Phi-Octopus Eden
2025-11-08 20:01:12.768055
"""

```python
from typing import List, Dict, Optional

class KnowledgeBase:
    def __init__(self):
        self.knowledge = {}

    def add_fact(self, fact: str) -> None:
        """Add a fact to the knowledge base."""
        if fact not in self.knowledge:
            self.knowledge[fact] = []

    def get_related_facts(self, fact: str) -> List[str]:
        """Get facts related to the given fact."""
        return self.knowledge.get(fact, [])

class ReasoningEngine:
    def __init__(self, knowledge_base: KnowledgeBase):
        self.knowledge_base = knowledge_base

    def infer_new_fact(self, fact: str) -> Optional[str]:
        """
        Infer a new fact based on existing facts.
        
        Args:
            fact (str): The input fact to infer.

        Returns:
            Optional[str]: A new inferred fact or None if no inference can be made.
        """
        related_facts = self.knowledge_base.get_related_facts(fact)
        if len(related_facts) == 0:
            return None
        
        # Simple rule: If 'A' is true, then 'B' is also true
        for r_fact in related_facts:
            if "A" in r_fact and "B" in fact:
                return f"{r_fact.replace('A', '')} {fact.split()[-1]}"
        
        return None

# Example usage
def main():
    kb = KnowledgeBase()
    kb.add_fact("If A, then B")
    
    engine = ReasoningEngine(kb)
    
    print(engine.infer_new_fact("B"))  # Should output 'If A, B'
    print(engine.infer_new_fact("C"))  # Should output None

if __name__ == "__main__":
    main()
```