Whitespaces in path causes error

When executing the dotnet build, the package is searching for wit-bindget, but if your path contains whitespaces the string path get cut.

Workaround:

declare in your csproj

```xml

path\without\whitespaces\to\wit-bindgen.exe

```

Start by reproducing the failure with dotnet build from a path containing whitespace, without setting WitBindgenExe in the csproj. Trace how the package locates and invokes wit-bindgen.exe, then verify that the same build succeeds from a whitespace-containing path without the workaround.

索引モデルが issue の本文から書いたものです。