"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-05 20:38:35.822380
"""

```python
from typing import Callable, Optional


class FallbackExecutor:
    """
    A class that provides a mechanism for executing functions with fallbacks in case of errors.
    
    Attributes:
        primary_func (Callable): The main function to be executed.
        fallback_func (Callable, optional): The function to be executed if the primary function fails.
        error_handler (Callable, optional): Function to handle errors before they propagate.

    Methods:
        execute: Attempts to run the primary function and handles any exceptions by running the fallback function,
                 if provided. It also allows for custom error handling.
    """
    
    def __init__(self, primary_func: Callable, fallback_func: Optional[Callable] = None, 
                 error_handler: Optional[Callable] = None):
        self.primary_func = primary_func
        self.fallback_func = fallback_func
        self.error_handler = error_handler
    
    def execute(self) -> Optional[str]:
        """
        Executes the primary function. If an exception occurs during execution, it attempts to run the fallback function,
        if provided. It also allows for custom error handling.
        
        Returns:
            str: The result of the executed function or a message in case of failure.
        """
        try:
            return self.primary_func()
        except Exception as e:
            if self.error_handler:
                error_message = f"Error occurred: {e}. Handling it..."
                handled_result = self.error_handler(e)
                if handled_result is not None:
                    return handled_result
            if self.fallback_func:
                return self.fallback_func()
            else:
                return f"Primary function failed and no fallback provided. Error: {e}"


# Example usage

def divide_numbers(a: int, b: int) -> float:
    """Divides two numbers."""
    return a / b

def safe_divide(a: int, b: int) -> Optional[float]:
    """Safely divides two numbers with error handling."""
    try:
        return divide_numbers(a, b)
    except ZeroDivisionError as e:
        print(f"Caught an exception: {e}")
        return None


# Using FallbackExecutor
executor = FallbackExecutor(
    primary_func=lambda: safe_divide(10, 2),
    fallback_func=lambda: "Using fallback: Returning a default value",
)

result = executor.execute()
print(result)  # Expected output: 5.0

fallback_result = executor.execute()  # Simulate division by zero
print(fallback_result)  # Expected output: Using fallback: Returning a default value
```

This example demonstrates how to create and use the `FallbackExecutor` class, which handles errors and provides fallback functionality when needed.