func (l *Logger) SetPrefix(lv int, prefix string) {
	l.mu.Lock()
	defer l.mu.Unlock()
	l.out.prefix[lv] = prefix
}
// SetPrefix sets the output prefix for the logger.
SetPrefix sets the output prefix for the logger.
// SetPrefix sets the output prefix for the logger .
func (l *Logger) SetPrefix(lv int, prefix string) {
	l.mu.Lock()
	defer l.mu.Unlock()
	l.out.prefix[lv] = prefix
}
func ( l * Logger ) SetPrefix ( lv int , prefix string ) { l . mu . Lock ( ) defer l . mu . Unlock ( ) l . out . prefix [ lv ] = prefix }
SetPrefix sets the output prefix for the logger.
SetPrefix sets the output prefix for the logger .