Function lowercase_extension

app/workflow/workflow.cpp:163–169

        throw std::runtime_error(
            "workflow path inputs expanded from placeholders must be absolute: " + value +
            " -> " + path.string());
    }
    return context.workflow_dir / path;
}

std::string lowercase_extension(const std::filesystem::path & path) {
    std::string ext = path.extension().string();
    std::transform(ext.begin(), ext.end(), ext.begin(), [](unsigned char ch) {
        return static_cast<char>(std::tolower(ch));
    });