Fix string conversion and many warnings

[PeterCDMcLean]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.53680% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ude/bitlib/bit-algorithms/transform_accumulate.hpp	42.85%	4 Missing ⚠️
include/bitlib/bit-iterator/bit_details.hpp	93.75%	2 Missing ⚠️
include/bitlib/bit-algorithms/accumulate.hpp	66.66%	1 Missing ⚠️
include/bitlib/bit-containers/bit_vector.hpp	93.75%	1 Missing ⚠️

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