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An address cannot be an arbitrary string because the address itself is not stored in the block chain
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The best you can do is an address like 1BitcoinEaterAddressDontSendf59kuE.
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You just given example of arbitrary string in blockchain as an address.
Yes, that is what I want to do. My own string in address. I don't need pvk nor pubkey.
Let's say I have "MyString" and I need to see it in address. Starting characters and ending can be any.
So, for example, I base58decode_check("MyStringChecksum"), I am getting bytes, add some at the end for proper length and checksum, and at the end base58encode_check the bytes giving me what I want.
I just don't know how to code that (mostly in Python 3).
I know the theory, I need working example of conversion.
Are you trying to say that You are not creating a valid Bitcoin address backed by a private key but you are crafting a custom, fake looking Base58Check string that resembles a Bitcoin address and This address visually contains your own string ( 1BurnBTC...), is Base58Check-encodable, but is not linked to any real private or public key making it unspendable who allows you to send BTC or dust to this address to embed a permanent message in the blockchain a form of on chain graffiti or proof of burn where the coins are intentionally lost forever?