Move variable declarations closer to usage #111

Job	Run time
Code Quality Checks	1m 2s
Build & Test (gcc-13, Release)	59s
Performance Regression Check	1m 24s
Build & Test (clang-15, Debug)	31s
Build & Test (gcc-13, Debug)	1m 5s
Build & Test (clang-15, Release)	33s
Sanitizer Tests (ASAN + UBSAN)	37s
Build Summary	3s
	6m 14s

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