add: lower case and moved sierpinski methods to functions #56

Job	Run time
Build wheels on Linux (x86_64)	22m 10s
Build wheels on Linux (aarch64/manylinux)	11m 38s
Build wheels on Linux (aarch64/musllinux)	7m 9s
Build with sanitizers for debugging purposes	2m 52s
Build wheels on macOS (arm64)	7m 31s
Build wheels on macOS (x86_64)	7m 47s
Build sdist and test extra dependencies	3m 59s
Build wheels on Windows (Win32)	7m 27s
Build wheels on Windows (ARM64)	14m 22s
Build wheels on Windows (x64)	25m 43s
Build wheels for WebAssembly	7m 22s
	1h 58m 0s

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