Optimize Hangman spacedOut function using set for guessed letters

[leticialunaz]

Changes:

Replaced the guessed list with a set() for O(1) lookups and prevention of duplicate letters.

Updated the game loop to only register a guess if it hasn’t been guessed before.

Modified spacedOut to efficiently display letters using the set.

Benefits:

Complexity reduced from O(n*k) to O(n).

Execution time drops significantly in benchmarks, improving overall game performance.

Prevents repeated penalties for the same incorrect guess.