Extension filler

        if (creep.memory.extensions.length == 0){
            creep.memory.extensions = [];
            var extensions = Game.spawns.Spawn1.room.find(FIND_MY_STRUCTURES, {
            filter: { structureType: STRUCTURE_EXTENSION }
            });
            for (interval = 0; interval < extensions.length; interval++){
                creep.memory.extensions.push(extensions[interval].id);
            }
        }

        var eNRG = creep.pos.findInRange(FIND_MY_STRUCTURES, 1, {
        filter: { structureType: STRUCTURE_EXTENSION }
        });
        creep.transferEnergy(eNRG[0]);
        for (var i = 0; i < creep.memory.extensions.length; i++){
            if (Game.getObjectById(creep.memory.extensions[i]).energy < Game.getObjectById(creep.memory.extensions[i]).energyCapacity){
                creep.moveTo(Game.getObjectById(creep.memory.extensions[i]));
                creep.transferEnergy(Game.getObjectById(creep.memory.extensions[i]));
                break;
            }
        }