Bug report: Base58 wrong conversion

[wackazong]

Describe the bug
The base58 implementation is producing incorrect results.

To Reproduce

1. Go to '...'
2. The result must be 16 times "1", not 17 times
3. Compare with the invert operation which is also wrong: https://gchq.github.io/CyberChef/#recipe=From_Base58('123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz',true)To_Decimal('Space',false)&input=MTExMTExMTExMTExMTExMQ
4. This gives me back 18 bytes, not 16 bytes.

Expected behaviour
Correct base58 string generation