It compiles, makes the robot "turn" (direction depends on your motor config), responds by "sweeping" at distances (from??) under 15cm (but never reverses to avoid the object so your sweeper must be longer than 15cm, or it will sweep until the 1 hour delay - you should indicate when the 1 hour delay is happening)... but what do you qualify as working? Describe the steps you expect it to perform.
If you you place `Serial.print();' statements alongside the motor and servo pin commands, you can "read" how (if) the code is working.