function touch() public {
        if (state != State.Active && state != State.Suspended) {
            return;
        }
        if (collectedWei >= hardCapWei) {
            state = State.Completed;
            endAt = block.timestamp;
            ICOCompleted(collectedWei);
        } else if (block.timestamp >= endAt) {
            if (collectedWei < lowCapWei) {
                state = State.NotCompleted;
                ICONotCompleted();
            } else {
                state = State.Completed;
                ICOCompleted(collectedWei);
            }
        }
    }