"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 13:43:03.908046
"""

```python
from typing import Callable


class FallbackExecutor:
    """
    A class that implements a fallback mechanism for executing functions.
    
    This class takes two functions as input: the primary function and the fallback function.
    If an error occurs while executing the primary function, the fallback function is executed.
    
    Args:
        primary_func (Callable): The main function to execute.
        fallback_func (Callable): The function to call if `primary_func` fails.
        
    Raises:
        Any exception that `primary_func` or `fallback_func` might raise.
    """
    
    def __init__(self, primary_func: Callable, fallback_func: Callable):
        self.primary_func = primary_func
        self.fallback_func = fallback_func
    
    def execute(self) -> None:
        try:
            self.primary_func()
        except Exception as e:
            print(f"Error occurred in primary function: {e}")
            self.fallback_func()


# Example usage
def main_function():
    """A simple function that may fail."""
    raise ValueError("An error occurred in the main function.")


def fallback_function():
    """A simple fallback function."""
    print("Executing fallback function.")


# Creating an instance of FallbackExecutor and using it
executor = FallbackExecutor(primary_func=main_function, fallback_func=fallback_function)
executor.execute()
```