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fix(learn): rework Rosetta Code SHA256 (#41936) 

* fix(learn): rework Rosetta Code SHA256

* fix: add extra info

* Add suggestions from Nick

Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>

Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
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curriculum/challenges/english/10-coding-interview-prep/rosetta-code/sha-256.md
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@ -8,11 +8,12 @@ dashedName: sha-256
# --description--
**[SHA-256](https://en.wikipedia.org/wiki/SHA-256)** is the recommended stronger alternative to [SHA-1](https://rosettacode.org/wiki/SHA-1).
The `SHA-2` family is a stronger alternative to `SHA-1`. The main difference between them is the length of the hash.
Meaning `SHA-1` provides a shorter code with fewer possibilities for unique combinations. `SHA-2` or `SHA-256` creates a longer and thus more complex hash with more possibilities.
# --instructions--
Write a function that takes a string as a parameter and returns its SHA-256 digest.
Research implemenation details and write a function that takes a string as the parameter and returns a hash using `SHA-256`
# --hints--