请找出下面代码中的所有错误。说明：以下代码是把一个字符串倒序，如“abcd”倒序后变为“dcba”。
1 #include "string.h"
2 int main()
3 {
4 char *src = "hello,world";
5 char *dest = NULL;
6 int len = strlen(src);
7 dest = (char *)malloc(len);
8 char *d = dest;
9 char *s = src[len];
10 while (len-- != 0)
11 *d++ = *s--;
12 printf("%s", dest);
13 return 0;
14
15}
https://www.nowcoder.com/questionTerminal/f7a1d80a3dad485db2d65aab9ae10bab
