func Warnf(format string, args ...interface{}) {
	if Log != nil {
		Log.Warn(fmt.Sprintf(format, args...))
	}
}
func Warnf(format string, args ...interface{}) {
	if Log != nil {
		Log.Warn(fmt.Sprintf(format, args...))
	}
}
func Warnf ( format string , args ... interface { } ) { if Log != nil { Log . Warn ( fmt . Sprintf ( format , args ... ) ) } }
// Warnf logs at the WARNING log level using a standard printf format string
Warnf logs at the WARNING log level using a standard printf format string