Create a Python function that turns a given integer into its negative counterpart.
The task is to write a Python function that converts an input integer into its negative form. If the input is -5, the output would be 5. If the input is 10, the output would be -10. ### Parameters - `num`: An integer which needs to be converted to its negative form. ### Return Value - Returns the integer `num` in its negative form by multiplying it with `-1`. ### Examples ```python convert_to_negative(1) # Returns: -1 convert_to_negative(-5) # Returns: 5 convert_to_negative(33) # Returns: -33 ```