char *folder_name = bprintf("%s_files", TRACE_get_filename());
char *filename = bprintf("%s/%f_%s.txt", folder_name, prefix,
((createContainer_t) event->data)->container->name);
char *folder_name = bprintf("%s_files", TRACE_get_filename());
char *filename = bprintf("%s/%f_%s.txt", folder_name, prefix,
((createContainer_t) event->data)->container->name);