Imports of package app

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
go.uber.org/zapPackage zap provides fast, structured, leveled logging.
osPackage os provides a platform-independent interface to operating system functionality.