Start with the program from Exercise $11$ in Chapter $4,$ "Structures," which adds two struct time values. Keep the same functionality, but modify the program so that it uses two functions. The first, time$\_$to$\_$secs$(),$ takes as its only argument a structure of type time, and returns the equivalent in seconds $($type long$).$ The second function $,$ secs$\_$to$\_$time$(),$ takes as itss only argument a time in seconda $($type long$),$ and returns a structure of type time.