[Bug] The name of executable file is wrong

- VS Code Version: v1.47.3
- OS Version: Windows 10
- Code Runner Version: v0.11.0

**Describe the bug**
When the dot appears twice in the source file, such as `filename..cpp`, the name of executable file will not be right. Instead, it will create a file without extensions like `filename.`.

Reproduce the issue in VS Code on Windows 10 with Code Runner v0.11.0 using a source file named filename..cpp. Trace the executable-name handling for filenames containing two dots. Done means the generated executable retains the intended filename and does not become filename. without an extension.

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