How do i combine list of bson.M elements into a single bson.M in mongo in golang?

lstMap := make([]interface{}, 0)
lstMap = mongoOps.AddToBsonMap(lstMap, bson.M{"$inc": bson.M{"Google.ab.Value": 1}})
lstMap = mongoOps.AddToBsonMap(lstMap, bson.M{"$inc": bson.M{"Google.ab1.Value1": 1}})

func (o *MongoOps) AddToBsonMap(lstMap []interface{}, value interface{}) (result []interface{}) {
lstMap = append(lstMap, value)
return lstMap

}

 I want the in this format :
 bson.M{"$inc": bson.M{"Google.ab.Value": 1, "AB.Value.to": 2}}

All the operation of same key needs to be appended.Thank you in advance

func (o *MongoOps) AddToBsonMapElement(lstMap map[string]interface{},     Operation string, key string, value interface{}) (result map[string]interface{})     {
status, msg := EmptyStructCheck(o)
if status == true {
	LogError(msg)
	panic(msg)
}
if Operation == "$addToSetEach" {
	if _, ok := lstMap["$addToSet"]; ok {
		childmap := lstMap["$addToSet"]
		subchildmap := childmap.(map[string]interface{})
		var val map[string]interface{}
		val = make(map[string]interface{})
		val["$each"] = value
		subchildmap[key] = val
		lstMap["$addToSet"] = subchildmap

	} else {
		lstMap["$addToSet"] = bson.M{key: bson.M{"$each": value}}
	}

	fmt.Println(reflect.TypeOf(lstMap))
} else if _, ok := lstMap[Operation]; ok {
	childmap := lstMap[Operation]
	subchildmap := childmap.(map[string]interface{})
	subchildmap[key] = value
	lstMap[Operation] = subchildmap

} else {
	childmap := make(map[string]interface{}, 0)
	childmap[key] = value
	lstMap[Operation] = childmap
}

return lstMap
}

This is what you can try