"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-06 03:58:39.025801
"""

```python
class FallbackExecutor:
    """
    A class designed to handle a series of tasks and fallback to an alternative
    method if the initial one encounters an error or fails to execute successfully.

    :param primary_func: Callable representing the primary task function.
    :param fallback_func: Callable representing the secondary task function to be used in case of failure.
    """

    def __init__(self, primary_func: callable, fallback_func: callable):
        self.primary_func = primary_func
        self.fallback_func = fallback_func

    def execute(self, *args, **kwargs) -> str:
        """
        Attempts to run the primary function with provided arguments. If it fails,
        the fallback function is executed instead.

        :param args: Positional arguments passed to both functions.
        :param kwargs: Keyword arguments passed to both functions.
        :return: A message indicating success or failure and which method was used.
        """
        try:
            result = self.primary_func(*args, **kwargs)
            return f"Primary function executed successfully. Result: {result}"
        except Exception as e:
            # Fallback to the secondary function
            fallback_result = self.fallback_func(*args, **kwargs)
            return (f"Failed to execute primary function.\n"
                    f"Fallback to secondary function successful. Result: {fallback_result}")

# Example usage

def multiply(a: int, b: int) -> int:
    """Multiply two integers."""
    return a * b

def add(a: int, b: int) -> int:
    """Add two integers."""
    return a + b

# Create an instance of FallbackExecutor
executor = FallbackExecutor(multiply, add)

# Test the executor with successful primary function execution
print(executor.execute(10, 5))  # Should use multiply and output "Primary function executed successfully."

# Test the executor with unsuccessful primary function execution
try:
    raise ValueError("Simulation of failure")
except Exception:
    print(executor.execute(10, b='5'))  # Should use add as fallback and output error message.
```

This code creates a `FallbackExecutor` class that attempts to run the primary function provided. If an exception occurs during execution, it falls back to running the secondary function and reports the result or failure accordingly. The example usage demonstrates how to use this class with two different functions: multiplication and addition.