your algorithm works well your only fail is to feed your vigener cipher machine with simbols others than alphabetics ones.
Problems of keeping spaces on your ciphertext are that there are some words that are very common on your language (examples: the, and, of, I, you ...), and the same goes for other simbols like the ``''' and the ``?''. So in old cipher methods is important to remove this simbols (except on transposition ciphers like the scitale ^_^>)
i think your algorithm failed because of those spureous simbols
prove with this text instead:
TheVigenerecipherknownbysomeaslechiffreindechiffrableFrenchfor
theindecipherablecipherisamethodofencryptionthatusesaseriesof
differentCaesarciphersbasedonthelettersofakeywordthoughthereis
someargumentamongcryptographiccirclesastowhichincarnationofthis
particularpolyalphabeticsubstitutioncanaccuratelybeattributedtoBlaise
deVigenereThisimplementationisasimpleformofapolyalphabetic
substitutionToencipheratableofalphabetscanbeusedtermedatabula
rectaorVigeneretableItconsistsofthealphabetwrittenout26times
indifferentrowseachalphabetshiftedcycliclytotheleftcomparedtothe
previousalphabetIncidentallytheresagoodchancethatthisplaintext
islongenoughtodisplaythecryptographicalweaknessofthisparticular
algorithmCanyouspotit
perl -Te 'print map { chr((ord)-((10,20,2,7)[$i++])) } split //,"turo"'
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