HexToDec: add structured answer.
Reverse: add structured answer.
EmToPx: use structured answer.
TwelveOclock: add structured_answer.
URLDecode: add structured_answer.
URLEncode: add structured answer
Fibonacci: use structured answer.
EmailValidator: use structured answer.
PigLatin: add structured answer.
GreatestCommonFactor: use structured answer.
CallingCodes: use structured answer.
Paper: use structured answer
Fortune: use structured answer.
BirthStone: use structured answer
Coin: use structured answer.
Base: use structured answer.
Rot13: use structured answer
Sha: add structured answer
Roman: add structured answer
Binary: use structured answer.