Write a four$-$five line function to determine and return the length of a caller$-$specified file. The length should be in raw bytes. $($Two of these lines are for finding the length of the file; the remaining $2-3$ lines are for cleaning up after yourself; I$\text{'}$m not counting the return statement.$)$ Note: the caller has previously opened the file and may intend on continuing to use it after you return.