func NewOrderQueue(price decimal.Decimal) *OrderQueue {
	return &OrderQueue{
		price:  price,
		volume: decimal.Zero,
		orders: list.New(),
	}
}
NewOrderQueue creates and initialize OrderQueue object
package orderbook
import (
	"container/list"
	"encoding/json"
	"fmt"
	"strings"
	"github.com/shopspring/decimal"
)
type OrderQueue struct {
	volume decimal.Decimal
	price  decimal.Decimal
	orders *list.List
}