feat: support multi level grouping(Upper limit up to 4th level)#149

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ryooo wants to merge 2 commits intoyamadashy:mainfrom ryooo:main

+524-315

Commits on Dec 1, 2024

feat: support multi level grouping(max lv4)
ryooo
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Commits on Dec 2, 2024

fix: When checking the identity of a prefix of Lv2 or higher with a prev, the prefixes at the higher level needed to be the same.
ryooo
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