harvest(creep){
        let source = Game.getObjectById(creep.memory.target)
        if(creep.harvest(source) === ERR_NOT_IN_RANGE){
            let result = creep.moveTo(source,{visualizePathStyle: {stroke: '#ffaa00'}})
            //console.log(result)
        }else{
            creep.say("Mining")
        }
    }