// Logger formats the message according to standard format specifiers from the fmt package
// and writes the message to writer specified by the concrete interface implementation.
type Logger interface {
	// Error formats and writes the error level message.
	Error(format string, v ...any)
	// Warning formats and writes the warning level message.
	Warning(format string, v ...any)
	// Info formats and writes the information level message.
	Info(format string, v ...any)
	// Debug formats and writes the debug level message.
	Debug(format string, v ...any)
}

logger := log.New()
logger.Info("Listen on port: %d", 8080)

logger := log.New(log.WithLevel(log.DBG))

level, levelErr := log.ParseLevel("warning")
if levelErr != nil {
	// handle error here
}
logger := log.New(log.WithLevel(level))

var w bytes.Buffer 
logger := log.New(log.WithWriter(w))

logger := log.New(log.WithNoColor())

logger := log.New(log.WithUTC())

// Short format:
// INF: 2022/07/08 11:22:30 server.go:111: message
logger := log.New(log.WithLineNum(log.ShortFmt))

// Long format:
// INF: 2022/07/08 11:22:30 /Users/heartwilltell/Go/app/server.go:111: message
logger := log.New(log.WithLineNum(log.LongFmt))

logger := log.New(log.WithLevelAtPrefixEnd())

logger := log.NewNopLog()