ref: a34083e8972bb336d453b93f0e491bce609f48c0
dir: /sys/src/libString/s_reset.c/
#include <u.h>
#include <libc.h>
#include "String.h"
String*
s_reset(String *s)
{
	if(s != nil){
		s = s_unique(s);
		s->ptr = s->base;
		*s->ptr = '\0';
	} else
		s = s_new();
	return s;
}
String*
s_restart(String *s)
{
	s = s_unique(s);
	s->ptr = s->base;
	return s;
}