Very cool code but harder to understand for me...I ran it and got the results as expected, with a tiny 'bug'. When I passed it the string "this is a very long sentence without spaces in between", the shortened string was "this is a very long ..." (no problem there).
When I passed it the string "thisisaverylongsentencewithoutspacesinbetween", the output was "thisisaverylongsentencewith..." i.e. without any space between the last character of that string and '...'.
Nothing serious really but just thought I would bring it up.
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