Refactoring

Company.java

// ...
    private void substractWithDiscount(final Money money, int discount) {
        account.substract(Money.newInstance(
              money.getAmount() + money.getAmount() * account.overdraftFee() * discount,
              money.getCurrency()));        
    }
    
    @Override
    public void withdraw(final Money money) {
        if (account.isOverdraft) {
            if (account.getType().isPremium()) {
                substractWithDiscount(money, companyOverdraftDiscount / 2);
            } else {
                substractWithDiscount(money, companyOverdraftDiscount);
            }
        } else {
            account.substract(Money.newInstance(money.getAmount(), money.getCurrency()));
        }
    }
// ...