backend: Tidy up whitespace

* Remove trailing space on line.
* Ensure that there is a newline at the end of the file.

crates/backend/src/ast.rs

@@ -1125,7 +1125,7 @@ fn extract_doc_comments(attrs: &[syn::Attribute]) -> Vec<String> {
                 // We want to filter out any Puncts so just grab the Literals
                 a.tts.clone().into_iter().filter_map(|t| match t {
                     TokenTree::Literal(lit) => {
-                        // this will always return the quoted string, we deal with 
+                        // this will always return the quoted string, we deal with
                         // that in the cli when we read in the comments
                         Some(lit.to_string())
                     },
@@ -1138,4 +1138,4 @@ fn extract_doc_comments(attrs: &[syn::Attribute]) -> Vec<String> {
     })
     //Fold up the [[String]] iter we created into Vec<String>
     .fold(vec![], |mut acc, a| {acc.extend(a); acc})
-}
+}