HarvestTrees 5X4

function cutTree()
    height=0
    turtle.dig()
    turtle.forward()
    while turtle.detectUp() do
        turtle.digUp()
        turtle.up()
        height = height+1
    end
    for i=1, height do
        turtle.down()
    end
end

function shiftLeft()
    turtle.forward()
    turtle.turnLeft()
    for i=1, 6 do
        turtle.forward()
    end
    turtle.turnLeft()
end

function shiftRight()
    turtle.forward()
    turtle.turnRight()
    for i=1, 6 do
        turtle.forward()
    end
    turtle.turnRight()
end

function returnHome()
    for i=1, 5 do
        turtle.forward()
    end
    turtle.turnLeft()
    for i=1, 18 do
        turtle.forward()
    end
    turtle.turnLeft()
end

function dropGoods()
    turtle.turnRight()
    turtle.turnRight()
    for i=1, 14 do
        turtle.select(i)
        turtle.drop()
    end
    turtle.turnRight()
    turtle.turnRight()
end

--Main

for i=1, 4 do   --Staring position
    turtle.forward()
end


for i=1, 4 do --row 1
    cutTree()
    for j=1, 5 do
        turtle.forward()
    end
end
cutTree()
shiftLeft()

for i=1, 4 do   --row 2
    cutTree()
    for j=1, 5 do
        turtle.forward()
    end
end
cutTree()
shiftRight()

for i=1, 4 do --row 3
    cutTree()
    for j=1, 5 do
        turtle.forward()
    end
end
cutTree()
shiftLeft()

for i=1, 4 do   --row 4
    cutTree()
    for j=1, 5 do
        turtle.forward()
    end
end
cutTree()




returnHome()    --Return to Starting Position
dropGoods()     --Place items in Chest