Can someone help me with this? Brain broken :)

/* exchange code */
#define ACCEXP_EXCHANGE_RATE 1500.0
#define QP_EXCHANGE_RATE 1200.0
#define GOLD_EXCHANGE_RATE 5.0
#define EXP_EXCHANGE_RATE 1.0
#define SRC_DST_ACCEXP 1
#define SRC_DST_QP 2
#define SRC_DST_GOLD 3
#define SRC_DST_EXP 4
#define NUM_EXCHANGE_TYPES 5 // one more than the last above
const char *exchange_types[NUM_EXCHANGE_TYPES] =
    {
        "",
        "account experience",
        "quest points",
        "gold coins",
        "experience"};
void show_exchange_rates(struct char_data *ch)
{
  send_to_char(ch, "Usage: exchange <currency source> <currency purchasing> <amount to purchase>\r\n");
  send_to_char(ch, "       This command is used to exchange in-game currencies including your "
                   "experience points, gold coins, account experience or quest points.\r\n");
  send_to_char(ch, "       currencies: accexp | qp | gold | exp\r\n");
  send_to_char(ch, "       current exchange rates: accexp: %d, qp: %d, gold: %d, exp: %d",
               (int)ACCEXP_EXCHANGE_RATE,
               (int)QP_EXCHANGE_RATE,
               (int)GOLD_EXCHANGE_RATE,
               (int)EXP_EXCHANGE_RATE);
  return;
}
// ACMD_DECL(do_cexchange)
ACMD(do_cexchange)
{
  char arg1[MAX_STRING_LENGTH] = {'\0'};
  char arg2[MAX_STRING_LENGTH] = {'\0'};
  char arg3[MAX_STRING_LENGTH] = {'\0'};
  float amount = 0.0, cost = 0.0, pool = 0.0;
  int source = 0, exchange = 0;
  /*temp*/
  if (GET_LEVEL(ch) < LVL_STAFF)
  {
    send_to_char(ch, "Under construction!\r\n");
    return;
  }
  /*TEMP*/
  three_arguments(argument, arg1, sizeof(arg1), arg2, sizeof(arg2), arg3, sizeof(arg3));
  if (!*arg1 || !*arg2 || !*arg3)
  {
    send_to_char(ch, "You need to provide more information.\r\n");
    show_exchange_rates(ch);
    return;
  }
  /* valid arguments */
  if (!is_number(arg3))
  {
    send_to_char(ch, "The third argument is invalid, it needs to be a number.\r\n");
    show_exchange_rates(ch);
    return;
  }
  amount = atoi(arg3);
  if (amount <= 0)
  {
    send_to_char(ch, "The third argument needs to be above 0.\r\n");
    show_exchange_rates(ch);
    return;
  }
  if (is_abbrev(arg1, "accexp"))
    source = SRC_DST_ACCEXP;
  else if (is_abbrev(arg1, "qp"))
    source = SRC_DST_QP;
  else if (is_abbrev(arg1, "gold"))
    source = SRC_DST_GOLD;
  else if (is_abbrev(arg1, "exp"))
    source = SRC_DST_EXP;
  else
  {
    send_to_char(ch, "The first argument is invalid.\r\n");
    show_exchange_rates(ch);
    return;
  }
  if (is_abbrev(arg2, "accexp"))
    exchange = SRC_DST_ACCEXP;
  else if (is_abbrev(arg2, "qp"))
    exchange = SRC_DST_QP;
  else if (is_abbrev(arg2, "gold"))
    exchange = SRC_DST_GOLD;
  else if (is_abbrev(arg2, "exp"))
    exchange = SRC_DST_EXP;
  else
  {
    send_to_char(ch, "The second argument is invalid.\r\n");
    show_exchange_rates(ch);
    return;
  }
  if (source == exchange)
  {
    send_to_char(ch, "Your source and desired currency types cannot be the same.\r\n");
    show_exchange_rates(ch);
    return;
  }
  /* everything should be valid by now, so time for some math */
  /* how much is this transaction going to "cost" */
  switch (exchange)
  {
  case SRC_DST_ACCEXP:
    cost = (float)ACCEXP_EXCHANGE_RATE * amount;
    /* cap for account xp currently */
    if ((amount + (float)GET_ACCEXP_DESC(ch)) > 33999.0)
    {
      send_to_char(ch, "Account experience caps at 34K.\r\n");
      return;
    }
    break;
  case SRC_DST_QP:
    cost = (float)QP_EXCHANGE_RATE * amount;
    break;
  case SRC_DST_GOLD:
    cost = (float)GOLD_EXCHANGE_RATE * amount;
    break;
  case SRC_DST_EXP:
    cost = (float)EXP_EXCHANGE_RATE * amount;
    break;
  default: /* should never get here */
    show_exchange_rates(ch);
    send_to_char(ch, "Please report to staff: reached default case in 1st exchange switch in do_cexchange.\r\n");
    return;
  }
  /* can we afford it? if so, go ahead and charge 'em */
  switch (source)
  {
  case SRC_DST_ACCEXP:
    pool = cost / ((float)ACCEXP_EXCHANGE_RATE); /* amount we need */
    if (pool < 1.0)
    {
      send_to_char(ch, "You need to increase the amount for this exchange.\r\n");
      return;
    }
    if (GET_ACCEXP_DESC(ch) < pool)
    {
      send_to_char(ch, "You do not have enough account exp, you need %d total.\r\n", (int)pool);
      return;
    }
    /* bingo! */
    GET_ACCEXP_DESC(ch) -= pool;
    save_account(ch->desc->account);
    send_to_char(ch, "You exchange %d account exp for ", (int)pool);
    break;
  case SRC_DST_QP:
    pool = cost / ((float)QP_EXCHANGE_RATE); /* amount we need */
    if (pool < 1.0)
    {
      send_to_char(ch, "You need to increase the amount for this exchange.\r\n");
      return;
    }
    if (GET_QUESTPOINTS(ch) < pool)
    {
      send_to_char(ch, "You do not have enough quest points, you need %d total.\r\n", (int)pool);
      return;
    }
    /* bingo! */
    GET_QUESTPOINTS(ch) -= pool;
    send_to_char(ch, "You exchange %d quest points for ", (int)pool);
    break;
  case SRC_DST_GOLD:
    pool = cost / ((float)GOLD_EXCHANGE_RATE); /* amount we need */
    if (pool < 1.0)
    {
      send_to_char(ch, "You need to increase the amount for this exchange.\r\n");
      return;
    }
    if (GET_GOLD(ch) < pool)
    {
      send_to_char(ch, "You do not have enough gold on hand, you need %d total on "
                       "hand (not in bank) to make the exchange.\r\n",
                   (int)pool);
      return;
    }
    /* bingo! */
    GET_GOLD(ch) -= pool;
    send_to_char(ch, "You exchange %d gold for ", (int)pool);
    break;
  case SRC_DST_EXP:
    pool = cost / ((float)EXP_EXCHANGE_RATE); /* amount we need */
    if (pool <= 0.0)
    {
      send_to_char(ch, "You need to increase the amount for this exchange.\r\n");
      return;
    }
    if (GET_EXP(ch) < pool)
    {
      send_to_char(ch, "You do not have enough experience points, you need %d total.\r\n", (int)pool);
      return;
    }
    /* bingo! */
    GET_EXP(ch) -= pool;
    send_to_char(ch, "You exchange %d experience points for ", (int)pool);
    break;
  default: /*shouldn't get here*/
    show_exchange_rates(ch);
    send_to_char(ch, "Please report to staff: reached default case in source switch in do_exchange.\r\n");
    return;
  }
  /* final portion of transaction, give them their purchase */
  switch (exchange)
  {
  case SRC_DST_ACCEXP:
    send_to_char(ch, "%d account experience.", (int)amount);
    GET_ACCEXP_DESC(ch) += (int)amount;
    save_account(ch->desc->account);
    break;
  case SRC_DST_QP:
    send_to_char(ch, "%d quest points.", (int)amount);
    GET_QUESTPOINTS(ch) += (int)amount;
    break;
  case SRC_DST_GOLD:
    send_to_char(ch, "%d gold coins.", (int)amount);
    GET_GOLD(ch) += (int)amount;
    break;
  case SRC_DST_EXP:
    send_to_char(ch, "%d experience points.", (int)amount);
    GET_EXP(ch) += (int)amount;
    break;
  default: /* should never get here */
    show_exchange_rates(ch);
    send_to_char(ch, "Please report to staff: reached default case in 2nd exchange switch in do_cexchange.\r\n");
    return;
  }
  return;
}
#undef ACCEXP_EXCHANGE_RATE
#undef QP_EXCHANGE_RATE
#undef GOLD_EXCHANGE_RATE
#undef EXP_EXCHANGE_RATE
#undef SRC_DST_ACCEXP
#undef SRC_DST_QP
#undef SRC_DST_GOLD
#undef SRC_DST_EXP
/*end exchange code */