Investigate if this is library is unnecessary

I think `format!` might do the same thing. See https://stackoverflow.com/questions/50458144/what-is-the-easiest-way-to-pad-a-string-with-0-to-the-left.

Start by reading the library's public API and comparing its behavior with Rust's format! macro, using the linked example as context. Done means the repository has a clear, evidence-based conclusion about whether the library provides distinct value or should be reconsidered.

Written by the indexing model from the issue text.