3a Write a function that takes a NULL-terminated string array and
returns a character matrix with the strings space-padded left to the
longest length, sorted alphabetically. Store the matrix dimensions at two
addresses which are also given as parameters. From main(), print the matrix.

4a Write a program that prints an HTML file named on the command line, except
for tags, from < to >. Any whitespace becomes a single space.
Print a newline (\n) for a <br> tag and two newlines for a <p> tag.

3b Write a function that takes a character matrix and its dimensions,
and returns a NULL-terminated alphabetically sorted array of strings,
each being a line of the matrix with all non-letters removed.

4b Write a program that takes an HTML file named on the command line
and looks for keys 'width' and 'height' inside tags which may have pairs
<tag key="value" ... key="value">   where 'tag' is an arbitrary string.
Example: print       width=42 height=40    for the tag
<img src="smiley.gif" alt="Smiley" height="40" width="42">