feat: cargo unload challenge

internal/model/order/order.go

@@ -16,11 +16,11 @@ func (o *Order) UnmarshalBinary(data []byte) error {
 	return json.Unmarshal(data, o)
 }
 
-func AsCommand[E DecodableCommand](c DecodableCommand) (E, bool) {
+func AsCommand[E DecodableCommand](c DecodableCommand) (result E, ok bool) {
 	if v, ok := c.(E); ok {
 		return v, true
 	}
-	return *new(E), false
+	return
 }
 
 type CommandType string
@@ -56,6 +56,7 @@ func (ct CommandType) String() string {
 }
 
 type DecodableCommand interface {
+	CommandID() string
 	CommandType() CommandType
 }
 
@@ -70,6 +71,10 @@ func (cm CommandMeta) CommandType() CommandType {
 	return cm.CmdType
 }
 
+func (cm CommandMeta) CommandID() string {
+	return cm.CmdID
+}
+
 func (cm *CommandMeta) Result(errCode int) {
 	cm.CmdErrCode = &errCode
 	cm.CmdApplied = new(bool(errCode == 0))