func: function claim_bounty(){
      
      
      if (this.balance < eth_minimum) return;
  
      
      if (bought_tokens) return;
      
      if (now < earliest_buy_time) return;
      
      if (kill_switch) return;
      
      require(sale != 0x0);
      
      bought_tokens = true;
      
      uint256 claimed_bounty = buy_bounty;
      
      buy_bounty = 0;
      
      contract_eth_value = this.balance - (claimed_bounty + withdraw_bounty);
      
      
      
      require(sale.call.value(contract_eth_value)());
      
      msg.sender.transfer(claimed_bounty);
    }