bug with comments at the end of lines of code

best explained by example: 

take this...
```
(if #t
  (begin
    (print "trueeeeee")
  ); end begin
)
```
run it through `scheme-format` and you end up with this

```
(if #t
 (begin
  (print "trueeeeee"))

 ; end begin)
```
which turns the last parens into a comment. :(
