Quick question about delimiters

I am in need of writing a function to take away delimters from a string so it
will be a string of only letters.  I have to do this without using any built
in functions... I feel like i am close, and logically, I fell like my code
should work, but i am getting problems when i call it.  this is what i have
so far.

fun remele (x, L) =
if null L then nil
else if hd x = hd L then remele(x,(tl L))
else if null(tl L) then remele(tl x, L)   -(*- I am not sure if this is
correct, but i want too check to see
else hd(L)::remele(x, tl L);         -(*if all elements were checked to then
go to the next element to check

remele([#" ", #",",#";",#".",#"\n",#"!",#"?"], explode("Hello, this is a
string!"));

should yield "hellothisisastring"

any suggestions?
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