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}

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