Decodes base16 (hexadecimal) encoded data into bytes. This function validates the input according to RFC 3548 Section 6: - The data must have an even number of characters - The data must only contain uppercase hexadecimal characters (0-9, A-F) # Arguments `data` - A string slice containing uppercase hexadecimal characters # Returns `Ok(Vec )` - Successfully decoded bytes `Err(String)` - Er
(data: &str)
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