编写一个方法，去掉一个数组的重复元素。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N 255

static int tmp[N];

void delete_duplication(char *src)
{
	
	int i, j;
	int index;
	int length = strlen(src);

	for (i = 0; i < length; ++i)
	{
		/* code */
		index = (int)(*(src + i));
		tmp[index] += 1;	

		if (tmp[index] == 1)
		{
			/* code */
			printf("%c", index);
		}
	}
	
}


int main(void)
{
	/* code */
	//char str[] = "asadasddasfadsgdfggdfgsdf";
	char str[] = "qwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnm";

	delete_duplication(str);

	return 0;
}