XOY-Leveldb

作者：谢瑞阳 10225101483 徐翔宇 10225101535

Historia

Chris Mumford 297e66afc1 Format all files IAW the Google C++ Style Guide. Use clang-format to correct formatting to be in agreement with the [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html). Doing this simplifies the process of accepting changes. Also fixed a few warnings flagged by clang-tidy. PiperOrigin-RevId: 246350737		5 lat temu
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memenv.cc	Format all files IAW the Google C++ Style Guide.	5 lat temu
memenv.h	Add CMake build support.	6 lat temu
memenv_test.cc	Format all files IAW the Google C++ Style Guide.	5 lat temu