TestProgram.lua

BlockList = {
    "minecraft:sponge",
}

function detectLeft()
    turtle.turnLeft()

    for i, Block in pairs(BlockList) do
        detected = turtle.detect(Block)
        if detected == true then turtle.turnRight() return true end
    end
    turtle.turnRight()
    return false
end

for i = 0, 20, 1 do

    if turtle.getFuelLevel() < 200 then
        turtle.refuel(1)
        print("Refueling")
    end

    print(detectLeft())

    turtle.forward()
end