Inventory Check Loop?

--Basic fuel check function
function checkFuel()
  if turtle.getFuelLevel() < 100 then
	repeat
	turtle.select(16)
turtle.refuel(2)
turtle.select(1)
	until turtle.getFuelLevel() >= 100
  end --if
end --checkFuel()

--Plants 4 Redwood saplings in a 2x2
function plantTree()
turtle.select(14)
turtle.forward()
turtle.place()
turtle.back()
turtle.place()
turtle.turnRight()
turtle.forward()
turtle.turnLeft()
turtle.forward()
turtle.place()
turtle.back()
turtle.place()
turtle.turnLeft()
turtle.forward()
turtle.turnRight()
end --plantTree()

--Applies bonemeal and checks if tree has grown. If not, sleeps and repeats.
function growTree()
turtle.select(15)
turtle.place()
turtle.up()
  if turtle.forward() == true then
	repeat
turtle.back()
turtle.down()
sleep(120)
turtle.place()
turtle.up()
	until turtle.forward() == false
end --if
turtle.down()
end --growTree()

--Cuts down the Redwood. Up the left side, then down the right side.
function cutTree()
turtle.dig()
sleep(0.25)
turtle.forward()
turtle.dig()
  local height = 0
  if turtle.detectUp() == true then
	repeat
turtle.dig()
turtle.digUp()
turtle.up()
height = height + 1
	until turtle.detectUp() == false
end --if
checkFuel()
turtle.turnRight()
  if turtle.detect() == true then
turtle.dig()
end --if
turtle.forward()
turtle.turnLeft()
  if turtle.detectDown() == true then
	repeat
turtle.dig()
turtle.digDown()
turtle.down()
height = height - 1
	until height == 0
end --if
turtle.dig()
end --cutTree()

--Deposits the first 7 slots in a chest behind the turtle.
function dropOff()
checkFuel()
turtle.turnLeft()
turtle.turnLeft()
turtle.forward()
turtle.forward()
turtle.forward()
turtle.forward()
turtle.forward()
turtle.select(1)
turtle.drop()
turtle.select(2)
turtle.drop()
turtle.select(3)
turtle.drop()
turtle.select(4)
turtle.drop()
turtle.select(5)
turtle.drop()
turtle.select(6)
turtle.drop()
turtle.select(7)
turtle.drop()
turtle.select(1)
turtle.turnLeft()
turtle.turnLeft()
turtle.forward()
turtle.forward()
turtle.forward()
turtle.forward()
turtle.turnLeft()
turtle.forward()
turtle.turnRight()
checkFuel()
end --dropOff()

--Attempts to light leftover leaves on fire, then returns to original position.
function burnTree()
  if turtle.detectUp() == false then
	repeat
turtle.up()
	until turtle.detectUp() == true
end
turtle.down()
turtle.select(13)
turtle.placeUp()
  if turtle.detectDown() == false then
	repeat
turtle.down()
	until turtle.detectDown() == true
end
turtle.select(1)
end --burnTree()

--Main Script
--PLACE checkInventory() function here.
checkFuel()
plantTree()
growTree()
checkFuel()
cutTree()
checkFuel()
dropOff()
burnTree()
shell.run("reboot")