function prepareLiquidityReserve() public onlyOwner {
        require(isIcoFinished());
       
        uint256 unsoldTokens = totalSupply.sub(tokensSold);
       / make sure there are any unsold tokens to be assigned
        require(unsoldTokens > 0);

       / try to allocate up to 10% of total sold tokens to Liquidity Reserve fund:
        uint256 liquidityReserveTokens = tokensSold.div(10);
        if (liquidityReserveTokens > unsoldTokens) {
            liquidityReserveTokens = unsoldTokens;
        }
        assignTokens(liquidityReserveWallet, liquidityReserveTokens);
        unsoldTokens = unsoldTokens.sub(liquidityReserveTokens);

       / if there are still unsold tokens:
        if (unsoldTokens > 0) {
           / decrease  (burn) total supply by the number of unsold tokens:
            totalSupply = totalSupply.sub(unsoldTokens);
        }

       / make sure there are no tokens left
        assert(tokensSold == totalSupply);
    }

    function manuallyAssignTokens(address recipient, uint256 amount) public onlyOwner {
        require(tokensSold < totalSupply);
        assignTokens(recipient, amount);
    }

   **
     * @dev Burns a specific amount of tokens.
     * @param _value The amount of token to be burned.
     */
    function burn(uint256 _value) public whenNotPaused {
        require(_value > 0);

        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply = totalSupply.sub(_value);
        Burn(burner, _value);
    }