Carmen
[1] ENGR 1181 Software Design Project. [online] Available at: https://osu.app.box.com/s/758htgbd1uuruzhjdp4emn3clkcqobe0 [Accessed 20 Nov. 2019].
MATLAB
[2] Mathworks.com. (2019). Determine whether array is empty – MATLAB isempty. [online] Available at: https://www.mathworks.com/help/matlab/ref/isempty.html [Accessed 20 Nov. 2019].
[3] Mathworks.com. (2019). Determine which characters are letters – MATLAB isletter. [online] Available at: https://www.mathworks.com/help/matlab/ref/isletter.html?searchHighlight=isletter&s_tid=doc_srchtitle [Accessed 2 Dec. 2019].