public static File getFile(URI resourceUri) throws FileNotFoundException {
        return getFile(resourceUri, "URI");
    }
Resolve the given resource URI to a {@code java.io.File},
i.e. to a file in the file system.

@param resourceUri the resource URI to resolve
@return a corresponding File object
@throws FileNotFoundException if the URL cannot be resolved to
                              a file in the file system
src/main/java/spark/utils/ResourceUtils.java