upgrade to 2.0.0 break previously working run_fun

it looks like it collapses string removing spaces

this code:
```
#[rustfmt::skip]
let version = run_fun!(bash --version)?;
info!("Your rust version is {version}")
```

Now causes this runtime error:
`Error: Custom { kind: NotFound, error: "Running [\"bash--version\"] failed: No such file or directory (os error 2) at src/main.rs:39" }`

v1.9.6 does not have this error.