* [haskell] Style fixes

No changes to functionality

* [haskell] Updated `assemble` function

assemble now takes a list of strings, rather than a single semicolon or newline -delimited string. This is more "Haskell-ish".

* [haskell] More style fixes

 Removed unused utility functions and renamed variables

Both samples/sample.c and bindings/haskell/sample/Sample.hs produce the same
output