Rust

refactor flow algorithm #1470

Job	Run time
build (ubuntu-22.04, x86_64-unknown-linux-gnu, linux-x64, general)	2m 50s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, linux-x64, zigbuild, 2.17)	4m 37s
build (ubuntu-22.04, riscv64gc-unknown-linux-gnu, linux-riscv64, cross)	3m 31s
build (macos-latest, aarch64-apple-darwin, darwin-arm64, general)	2m 38s
build (macos-latest, x86_64-apple-darwin, darwin-x64, general-macos-intel)	2m 1s
build (windows-latest, x86_64-pc-windows-msvc, win32-x64, general)	5m 22s
build (ubuntu-22.04, aarch64-unknown-linux-gnu, linux-arm64, zigbuild, 2.17)	4m 28s
build (ubuntu-22.04, x86_64-unknown-linux-musl, linux-musl, cross)	3m 49s
build (windows-latest, aarch64-pc-windows-msvc, win32-arm64, general)	5m 5s
build (windows-latest, i686-pc-windows-msvc, win32-ia32, general)	5m 6s
release	0s
	39m 27s

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