"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 01:12:28.532227
"""

```python
from typing import Callable, Any, Optional

class FallbackExecutor:
    """
    A class that provides a mechanism for executing a function with fallbacks in case of errors.
    
    Attributes:
        primary_func (Callable): The main function to be executed.
        fallback_func (Optional[Callable]): The function to be executed as a fallback if an error occurs.
    
    Methods:
        execute: Attempts to run the primary function, and executes the fallback function on error.
    """
    
    def __init__(self, primary_func: Callable[..., Any], fallback_func: Optional[Callable[..., Any]] = None):
        self.primary_func = primary_func
        self.fallback_func = fallback_func
    
    def execute(self) -> Any:
        try:
            result = self.primary_func()
        except Exception as e:
            if self.fallback_func is not None:
                print(f"Primary function failed: {e}. Fallback in use.")
                result = self.fallback_func()
            else:
                raise e
        return result

# Example usage
def main_function() -> str:
    """Main function that may fail."""
    raise ValueError("An error occurred in the primary function")

def fallback_function() -> str:
    """Fallback function to be executed if the primary fails."""
    return "Using fallback function"

if __name__ == "__main__":
    executor = FallbackExecutor(primary_func=main_function, fallback_func=fallback_function)
    result = executor.execute()
    print(f"Result: {result}")
```

This Python code defines a class `FallbackExecutor` that can be used to execute a primary function and provide a fallback in case the primary function fails. The example usage demonstrates how to create an instance of this class with both a primary and a fallback function, and how to use it to handle potential errors gracefully.