build/transaction.go
func (m SourceAccount) MutateTransaction(o *TransactionBuilder) error {
	return setAccountId(m.AddressOrSeed, &o.TX.SourceAccount)
}
func (m SourceAccount) MutateTransaction(o *TransactionBuilder) error {
	return setAccountId(m.AddressOrSeed, &o.TX.SourceAccount)
}
// MutateTransaction for SourceAccount sets the transaction's SourceAccount
// to the pubilic key for the address provided