This might do what you want. Itís meant to be invoked as a command line tool per file and it sends its results to STDOUT. Itís essentially a one-liner unrolled to a script. You can put in an -i flag to edit the file in place but this is risky. Donít do it unless you have backups and are going to check everything. Save it as, space-collapser.pl or whatever you likeĖ
Update: I donít have a lot of experience with WIN on this frontÖ Iím, not sure this will work for you as is.
space-collapser.pl file dir-with-files/*
#!/usr/bin/env perl -0777 -p
# -0777, idiom for "slurp" mode.
# Strip all trailing spaces including blank lines with spaces.
# Reduces all triple or greater line spacing to double spaced lines.
# -p print at the end of each implicit loop.
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