FYI: The fastest solution mentioned at the problem description uses a lookup-table. Don't beat yourself too much.
Hello, William. I like very much the originality & especially the efficiency of your approach here. Am I correct in thinking that the existing code would struggle to correctly decode a message that was encoded from (say) "Beware of the Sasquatch Man's involvement in Operation Phoenix"? [I don't want to explain this, to avoid giving too many clues to others. But I hope you get my point.] Although I am confident you could tweak your code (if necessary) to handle such cases. —DIV
Determine if input is odd
Program an exclusive OR operation with logical operators
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Reference Index Number
Implement a bubble sort technique and output the number of swaps required
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Make your own Test Suite (part 1)
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Back to basics: adding comments to your code
Make your own Test Suite (part 3)
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