bool do_send_money(tools::wallet2& w1, tools::wallet2& w2, size_t mix_in_factor, uint64_t amount_to_transfer, transaction& tx, size_t parts=1)
{
  CHECK_AND_ASSERT_MES(parts > 0, false, "parts must be > 0");

  std::vector<currency::tx_destination_entry> dsts;
  dsts.reserve(parts);
  uint64_t amount_used = 0;
  uint64_t max_part = amount_to_transfer / parts;

  for (size_t i = 0; i < parts; ++i)
  {
    currency::tx_destination_entry de;
    de.addr = w2.get_account().get_keys().m_account_address;

    if (i < parts - 1)
      de.amount = random(max_part);
    else
      de.amount = amount_to_transfer - amount_used;
    amount_used += de.amount;

    //std::cout << "PARTS (" << amount_to_transfer << ") " << amount_used << " " << de.amount << std::endl;

    dsts.push_back(de);
  }

  try
  {
    w1.transfer(dsts, mix_in_factor, 0, DEFAULT_FEE, std::vector<uint8_t>(), tools::detail::null_split_strategy, tools::tx_dust_policy(DEFAULT_FEE), tx);
    return true;
  }
  catch (const std::exception&)
  {
    return false;
  }
}
bool do_send_money(tools::wallet2& w1, tools::wallet2& w2, size_t mix_in_factor, uint64_t amount_to_transfer, transaction& tx, size_t parts=1)
{
  CHECK_AND_ASSERT_MES(parts > 0, false, "parts must be > 0");

  std::vector<cryptonote::tx_destination_entry> dsts;
  dsts.reserve(parts);
  uint64_t amount_used = 0;
  uint64_t max_part = amount_to_transfer / parts;

  for (size_t i = 0; i < parts; ++i)
  {
    cryptonote::tx_destination_entry de;
    de.addr = w2.get_account().get_keys().m_account_address;

    if (i < parts - 1)
      de.amount = random(max_part);
    else
      de.amount = amount_to_transfer - amount_used;
    amount_used += de.amount;

    //std::cout << "PARTS (" << amount_to_transfer << ") " << amount_used << " " << de.amount << std::endl;

    dsts.push_back(de);
  }

  try
  {
    tools::wallet2::pending_tx ptx;
    std::vector<size_t> indices = w1.select_available_outputs([](const tools::wallet2::transfer_details&) { return true; });
    w1.transfer(dsts, mix_in_factor, indices, 0, TEST_FEE, std::vector<uint8_t>(), tools::detail::null_split_strategy, tools::tx_dust_policy(TEST_DUST_THRESHOLD), tx, ptx, true);
    w1.commit_tx(ptx);
    return true;
  }
  catch (const std::exception&)
  {
    return false;
  }
}