trim off the write space

Hi all,
I have a question on the trimming off the extra white space.

SET LINESIZE 300

f1 f2 f3
aaaaa,bbbb,ccccc
ddddd,eeee,fffff

SELECT f1||chr(13),f2||chr(13),f3
FROM

aaaaa,
bbbbb,
ccccc < THERE are SOME big white space here >
ddddd,
eeeee,
fffff < There are Some big white space here >

What is the best way to remove off the big white space ?

Thank You

what the heck are those aaa bbb ccc? columns or what?
if I write

f1 f2 f3
aaaaa,bbbb,ccccc
ddddd,eeee,fffff

in sqlplus prompt I will get error so I am not sure what you are talking about

Sorry for unclear question,

actually the aaaa,bbbb,cccc is already spool to a file format then I want it to be output into the vertical format for each record.

That's why, after each field I concat with the CHR(13) but not the last column of the field. The last column always embeded some whitespace.

Anyway, I solved the problem using SET TRIMSPOOL ON before run the script.

Thanks for the feedback