This will not work please help.

function s3()
turtle.select(3)
turtle.compare()
end

function sap()
turtle.select(1)
if turtle.compare() == true then
turtle.select(2)
turtle.place()
elseif
s3() == true then
harvest()
else
turtle.dig()
turtle.select(1)
turtle.place()
sap()
end
end

function logger()
for i=1, 7 do
turtle.up()
end
end

function harvest()
turtle.dig()
turtle.forward()
logger()
end

sap()



In my current slots of the turtle I have

S1 Sapling

S2 Bonemeal

S3 Birch Log

It's skipping over my else if and going straight to the else. So say it places the sapling and grows the tree perfect but when I want it to cut
it down it just breaks the first log and places a sapling again and tries to grow it
it's not checking my elseif to see that it's birchwood so it can start the cut down process.
I'm sure this is more complicated than it should be but I'd like to understand why it's not working so I can fix these problems when I get more advanced