Create base58 module (and remove dependency)

[SimonLab]

At the moment we are using the following package https://github.com/nocursor/b58 to convert the cid to base58.

This package provide much more than we need and to avoid having another dependency we can add a simplified version of base58 to the cid project

• [x] Create a hex.pm package B58 which expose the function B58.encode which takes one parameter (a binary) and returns a string containing only the set of characters from the base58 btc: 123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz

ref: https://en.wikipedia.org/wiki/Base58

[nelsonic]

@SimonLab thanks for opening this issue. ✅ https://hex.pm/packages/b58

Let's fix this 404 with the following repo: https://github.com/dwyl/elixir-base58-encode

[SimonLab]

Just for info if people are looking for https://github.com/nocursor/b58 on hex, the name of the package is basefiftyheight: https://hex.pm/packages/basefiftyeight

[nelsonic]

@SimonLab I know ... the naming is a fail. ideally it should be base58encode https://hex.pm/packages/base58encode which describes exactly what the package does (or will do)

[SimonLab]

The package is now public at https://hex.pm/packages/b58 I'm going to add it to the dependency of CID and check that all our tests are still working

[SimonLab]

error when trying to run mix test (`mix deps.get was run before)

[SimonLab]

The error is due to a mismatch in the base58encode package in the name, see https://github.com/dwyl/base58encode/issues/11

[SimonLab]

We are now using b58 elixir package in CID, see #30