rem: hash_find(void *_hash_table, void *e)
add: hash_find(struct hash_table *table, void *searchedElement)
context: hash_find(void *_hash_table, void *e){	struct hash_table *t = (struct hash_table *)_hash_table;	void *i;	unsigned int hash;	hash = t->hash_func(e, NULL, t->table_size);	for (i = t->table[hash]; i != NULL; i = NEXT(t, i)) {		if (i == e)			return i;	}	return NULL;}