Minecraft Turtle Program - 2x2 tree feller

term.clear()
print("Start facing a 2x2 tree, lower left block")

startingfuel = turtle.getFuelLevel()

print("-----------")
print("Turtle fuel:")
print(startingfuel)

if (startingfuel<300) then
   print("--------------------------------------")
   print("Low on fuel! (should have at least 300)")
   return
end

height = 0
trees = 0
forward = 0
detect = false
turtle.select(1)

function iniMove()
  if turtle.detect() then
    turtle.dig()
    turtle.forward()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
    forward = 1
  end
end

function mineTree()
  if (forward == 1) then
     if turtle.detectUp() then
       detect = true
     else
       detect = false
     end
     while detect do
       if turtle.detectUp() then
         turtle.digUp()
         turtle.up()
         turtle.dig()
          turtle.forward()
          turtle.turnRight()
          turtle.dig()
          turtle.forward()
          turtle.turnRight()
          turtle.dig()
          turtle.forward()
          turtle.turnRight()
          turtle.forward()
          turtle.turnRight()
         height=height+1
       else
         detect = false
       end
     end
  end
end

function reset()
  if(forward == 1) then
     if height>0 then
         for i=0,height,1 do
          turtle.down()
          height=height-1
         end
     end
  end
  forward = 0
  turtle.select(1)
end

iniMove()
mineTree()
reset()

print("---------------------")
print("Ending turtle fuel:")
print(turtle.getFuelLevel())
print("Fuel used:")
print(startingfuel-turtle.getFuelLevel())