void key_value_storage_clear(key_value_storage_t* stor);
int key_value_storage_add(key_value_storage_t* stor, const char* key, const char* value);
char* key_value_storage_find(key_value_storage_t* stor, const char* key);
+int key_value_storage_length(key_value_storage_t* stor);
void key_value_storage_print(key_value_storage_t* stor, const char* head, const char* sep, const char* tail);