Refactoring / code cleanup.

See:

* https://en.wikipedia.org/wiki/Code_refactoring

* https://www.refactoring.com/

* https://www.joelonsoftware.com/2002/01/23/rub-a-dub-dub/

Some small optimisations may have slipped in as well.

fc-solve/site/wml/src/ts/web-fc-solve--expand-moves.ts

@@ -258,15 +258,22 @@ export function fc_solve_expand_move(
         /^Move ([0-9]+) cards from stack ([0-9]+) to stack ([0-9]+)$/,
     );
 
+    const raw_ret = [
+        {
+            str: initial_move.str,
+            type: "m",
+        },
+    ];
+
     if (!matched) {
-        return [initial_move];
+        return raw_ret;
     }
 
     const ultimate_num_cards = _to_int(matched[1]);
 
     // TODO : Implement the case where the sequence move is unlimited.
     if (ultimate_num_cards === 1) {
-        return [initial_move];
+        return raw_ret;
     }
 
     const ultimate_source = _to_int(matched[2]);