As you may have noticed, lots of files in this directory ^_^;;
These are three different implementations of the same functional program...

C version is character based.  It buffers whitespaces in memory, and write
or flushes based on next non-whitespace character.  It's the fastest and
most memory efficient.

OCaml version is line/file based.  It reads the entire file to memory
before writing it back out to disk.  Whitespaces are removed using simple
linear search.

Perl version is line based.  It reads each line to memory and writes them
immediately to output.  Whitespaces are removed using regular expression
substitutions.  This version, unlike the other two, does not preserve file
when both input and output are the same.

OCaml version was eventually chosen to fit the template image, because
that's the version that fits best...