void memcached_string_free(memcached_string_st *string);
memcached_return memcached_do(memcached_server_st *ptr, char *commmand,
size_t command_length, uint8_t with_flush);
-memcached_return memcached_version(memcached_st *ptr);
memcached_return value_fetch(memcached_server_st *ptr,
char *buffer,
memcached_result_st *result);