//编写函数实现字符串旋转

#include <stdio.h>

#include <assert.h>

#include <string.h>

void reverse(char *left, char *right)

{

	char temp;

	assert(left);

	assert(right);

	while (right > left)

	{

		temp = *left;

		*left = *right;

		*right = temp;

		left++;

		right--;

	}

}

char *rotate(char *src, int n)

{

	int len = strlen(src);

	assert(src);

	reverse(src, src + n-1);

	reverse(src + n, src+len-1);

	reverse(src, src + len - 1);

	return src;

}

int main()

{

	char p[] = "abcdef";

	printf("%s\n", rotate(p, 2));

	return 0;

}