return better replace

src/rustint/core.clj

@@ -2531,6 +2531,7 @@
 
 (defn especificador-formato [arg, rustf]
   (cond
+    (char? arg) "%c"
     (string? arg) "%s"
     (int? arg) "%d"
     (and (float? arg) (nil? rustf) (== (pasar-a-int arg) arg)) "%.0f"
@@ -2544,13 +2545,10 @@
 )
 
 (defn replace-groups [string groups]
-  (if (empty? groups)
-    string
-    (
-      replace-groups
-        (clojure.string/replace-first string #"\{:?(.\d+)?\}" (first groups))
-        (rest groups)
-    )
+  (cond
+    (nil? groups) string
+    (empty? groups) string
+    :else (replace-groups (clojure.string/replace-first string #"\{:?(.\d+)?\}" (first groups)) (rest groups))
   )
 )
 
@@ -2561,11 +2559,9 @@
                              (rest args)
                              (get-rust-formatters (first args))
                             )
-      ] (if (empty? clojure-fspecifiers)
-          args
+      ]
     (cons (replace-groups (first args) clojure-fspecifiers) (rest args))
   )
-  )
 )
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;