Perl Quiz-of-the-Week #1

Write a function, 'center', whose argument is a list of strings, which
will be lines of text.  'center' should insert spaces at the beginning
of the lines of text so that if they were printed, the text would be
centered, and return the modified lines.

For example,

        center("This", "is", "a test of the", "center function");

should return the list:

        "     This", "      is", " a test of the", "center function"

because if these lines were printed, they would look like:

             This
              is
         a test of the
        center function

----------------------------------------------------------------

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