面试题目写一个字符串逆序函数strrev()

/*字符串逆序*/
#include
#include
#include
char* strrev(const char *);
int main(int argc , char *argv[])
{
	printf("%s\n",strrev("helloworld!!"));
	return 0;
}
char* strrev(const char *org)
{
	int size = strlen(org);
	char *tgt_p = NULL, *org_p = NULL;
	char *tgt = (char *)calloc(sizeof(char),size+1);
	
	tgt_p = tgt;
	org_p = org + size - 1;
	
	do
	{
		*tgt_p = *org_p;
		++tgt_p;
		--org_p;
	}while(org <= org_p);
	*(tgt + size) = '\0';
	
	return tgt;
}