Companion Ladder Placing

term.clear()
term.setCursorPos(1,1)
print("This program will place ladders straight down on the block it's facing")
print("")
print("It will also attempt to fill gaps with a material")
print("")
print("Place fuel in the bottom left")
print("Place ladders in the top left")
print("And place building material beside the ladders")
print("Press any key when ready or press o to quit")
key = os.pullEvent("char")
if key ~= "o" then
term.clear()
term.setCursorPos(1,1)
ladders = turtle.getItemCount(1)
blocks = turtle.getItemCount(2)
Nfuel = turtle.getItemCount(16)
fuel = turtle.getFuelLevel()
dist = 0

--Getting Fuel
Cfuel = 0
while Cfuel == 0 do
while fuel < 200 do
fuel = turtle.getFuelLevel()
turtle.select(16)
turtle.refuel(1)
Nfuel = turtle.getItemCount(16)
if Nfuel == 0 then
print("Add More Fuel")
print("Press any key when done")
os.pullEvent("char")
Nfuel = turtle.getItemCount(16)
end
end
Cfuel = 1
print("Successfully Fueled!")
end

turtle.forward()
turtle.turnRight()
turtle.turnRight()
turtle.back()
while turtle.down() and ladders ~= 0 do
dist = dist + 1
turtle.select(1)
if turtle.place() == false and dist > 2 then
if not turtle.detect() then
turtle.forward()
turtle.select(2)
turtle.place()
turtle.back()
turtle.place()
end
end
ladders = ladders - 1
end
for i=1, dist do
turtle.up()
end
if ladders == 0 then
turtle.up()
end
turtle.forward()
turtle.forward()
turtle.turnRight()
turtle.turnRight()
else
print("Goodbye")
end