Fix reflection warnings

Author: ovistoica

src/simulflow/utils/core.clj

@@ -10,7 +10,7 @@
 (defmulti encode-base64 (fn [s] (class s)))
 
 (defmethod encode-base64 String
-  [s]
+  [^String s]
   (let [encoder (Base64/getEncoder)]
     (.encodeToString encoder (.getBytes s "UTF-8"))))
 
@@ -20,7 +20,7 @@
     (.encodeToString encoder bytes)))
 
 (defn decode-base64
-  [s]
+  [^String s]
   (let [decoder (Base64/getDecoder)]
     (.decode decoder s)))