Blout removes extra blank lines from a file, collapsing multiple blank
lines down to one, (or removing them altogether with the -compact option).
It also ensures the file has a final CrLf.  It also trims any blank lines
off the beginning and end of the file.  It also converts all line endings
to Windows standard CrLf form.  It trims trailing tabs and spaces from
each line.
Blout is not that bright.  It does not understand wildcards except those
expanded by the OS, However, you can put multiple files on the command line.
usage:
blout.exe  somefile.txt  anotherfile.txt
You can also ask it to get rid of  blank lines altogether with:
blout.exe  -compact somefile.txt  anotherfile.txt
For Windows, C source included.  It is not smart enough to handle Unix Lf
line conventions.  It can handle arbitrarily large files.  They do not
have to fit in RAM.  Because of this feature, files will get a new date
whether anything changed or not.  It is designed so that if you abort part
way through, your original file will be unchanged.