* `(?!\.)` should not starts with `.`
* `(?!/)` should not starts with `/`
* `(?!.*\.$)` should not end with `.`
* `(?!.*/$)` should not end with '/`
* `(?!.*\.\.)` should not contains `..`
* remove dotnet-tool.json because the project does not rely on any dotnet tools.
* remove Directory.Build.props because the solution has only one project.
* move src/SourceGit to src. It's not needed to put all sources into a subfolder of src since there's only one project.