// Trades two stock shares from a defunct corporation for a
// share of the acquiring one
func (g *Game) trade(corp interfaces.Corporation, amount int) {
acquirer := g.mergeCorps["acquirer"][0]
amountSharesAcquiringCorp := amount / 2
corp.AddStock(amount)
acquirer.RemoveStock(amountSharesAcquiringCorp)
g.CurrentPlayer().
RemoveShares(corp, amount).
AddShares(acquirer, amountSharesAcquiringCorp)
}
// Sells owned shares of a defunct corporation, returning them to the
// corporation's stock
func (g *Game) sell(pl interfaces.Player, corp interfaces.Corporation, amount int) {
corp.AddStock(amount)
pl.RemoveShares(corp, amount).
AddCash(corp.StockPrice() * amount)
}