VirusTotal Scanning

I've read over the docs, and I don't know why, but I can do every other action with this app. But for some reason, testing VirualTotal never works.

```shell
curl -X PUT --upload-file nhgbhhj https://x.domain.lan/test.txt/virustotal
invalid character '<' looking for beginning of value
```

And then transfer.sh logs returns a curl 500 error.

Just to eliminate something dumb, I even used the example straight out of the docs, and created a file named `nhgbhhj`; with text inside to ensure it wasn't trying to push an empty file.

If I add a `/` to the end of the URL, or change the capitalization, no error, but nothing posts or outputs

```shell
curl -X PUT --upload-file nhgbhhj https://x.domain.lan/test.txt/virustotal/
```

Any help would be awesome with this.

I found the log file, which outputs the following:

```console
[transfer.sh] starting to listen on: :8080
[transfer.sh] ---------------------------
[transfer.sh] Submitting to VirusTotal: test.txt 5
[transfer.sh] scanid: , resource: , permalink: , md5:
[transfer.sh] "PUT /test.txt/virustotal HTTP/1.1" 500 "" "curl/7.81.0"
[transfer.sh] Submitting to VirusTotal: test.txt 5
[transfer.sh] scanid: , resource: , permalink: , md5:
[transfer.sh] "PUT /test.txt/virustotal HTTP/1.1" 500 "" "curl/7.81.0"
[transfer.sh] Error metadata: open /tmp/test.txt/virustotal.metadata: no such file or directory
[transfer.sh] "GET /test.txt/virustotal HTTP/1.1" 404 "" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100211 Firefox/141.0"
```

But no matter what I do, I get the `<` error. And after looking online, it appears to be a GoLang JSON error.

---

After looking through the code, it appears to be coming from the Go package https://github.com/dutchcoders/go-virustotal via the line

```go
vt, err := virustotal.NewVirusTotal(s.VirusTotalKey)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
```

The `err` is returning
```
%!s()
```

Start at the PUT /test.txt/virustotal handler and trace the virustotal.NewVirusTotal call shown in the issue, then reproduce the request with the provided curl command and inspect the go-virustotal response. Done means VirusTotal scanning no longer returns HTTP 500 or the '<' JSON error, and the scan metadata is returned or logged successfully.

Written by the indexing model from the issue text.