Stefan Rusterholz wrote:
> 
> Wow, I'm surprised nobody had the idea of simply using Array#abbrev, 
> which is included in the stdlib.
> 
> Regards
> Stefan

Well that looks simple enough!   Looks like I would take the shortest 
key returned and chop! the last character to get the common prefix.   If 
the shortest key length was 1, there is no common prefix.

I had never used Abbrev before - thanks for pointing it out.   This 
wasn't a contest, but if it were - I think you won!

Todd
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