capital
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capital is a lightweight plugin written for our extensibel shell. The 
plugin's usage is as follows: "capital [-a] <state name>". <state name>
is the name of any of the 50 US states. When used without the -a
switch, capital will print to STDOUT the capital city of the state the
user inputs. When used with "-a" switch, the program will still output
the capital of that state as before, but also the abbreviation of that
state as well. If the user inputted an invalid state, an appropriate 
message is printed to STDOUT.

For example, entering "capital New Jersey" at the prompt will print
New Jersey's capital is: Trenton 

Entering "capital -a New Jersey" will output:
New Jersey's capital is: Trenton
New Jersey's abbreviation is: NJ

This program is implemented in an ad-hoc manner with many if/else
blocks. We use the method strcat() to concatenate state names that
are two words (e.g. New Jersey). 

capital is supported on all shells.