Hi,

• naming conventions of the languages must be followed => hexadecimal
• '0' should equal '' -> this is wrong
• WHY ignoring the sign...? -> this is wrong as well (and not specified. Note: examples != specifications)
• no random tests
• you're basically asking for a builtin
• too much "déjà vu" <=> duplicate

If you're interested in authoring kata, you should read the documentation about it before your next try (I'd suggest you unpublish this one: it won't survive the beta phase anyway)

Cheers!