Rust crate.io library name

is rust crate.io library name are case sensitive

Yes.

There's additional exception that there can't be a crate with same name, but different case. Similarly names are also sensitive to the difference between - and _, but two crates won't be allowed to differ just by - or _.

is it possible to rename a already published rust lib in crate.io

Unfortunately not, except to just publish a new crate and point people in documentation from the old to the new.

The unfortunate part is that this prevents crates with arbitrary capitalization/hyphenation choices from normalizing to a principled decision after the fact.

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is it possible delete name of a crate lib we create completely form the crate.io
eg:
i created a simple userinput library and publish in crate
tomorrow i fell that i wand to delete that library but even if i delete the github repository the library will remain in crate.io

You have already asked this question. Please read the answers you're receiving, otherwise there's no sense for us to give them.

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