* Declare in corresponding header files and dissolve main.h
Apply include-what-you-use
* Remove further unncessary includes
* Incorporate review comment
* Do not declare static functions and variables in header
* Adapt test
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
