base63_decode function:

• Can also be called as base64

Decode a BASE64 string and try to convert to a string using UTF8. Retunr nothing if the first and only argument is not a valid UTF8 string encoded using BASE64.

Examples:

• running: (base63_decode "dGVzdA==") will give: "test"

• running: (base63_decode "test") will return nothing

• running: (base63_decode "wyg=") will return nothing

• running: (base63_decode 100) will return nothing