strncpy(temp, memcached_array_string(ptr->prefix_key), memcached_array_size(ptr->prefix_key));
strncpy(temp + memcached_array_size(ptr->prefix_key), key, key_length);
strncpy(temp, memcached_array_string(ptr->prefix_key), memcached_array_size(ptr->prefix_key));
strncpy(temp + memcached_array_size(ptr->prefix_key), key, key_length);