Refactor SnodeApi

libsignal/src/main/java/org/session/libsignal/utilities/Base64.java

@@ -1,5 +1,7 @@
 package org.session.libsignal.utilities;
 
+import androidx.annotation.NonNull;
+
 /**
  * <p>Encodes and decodes to and from Base64 notation.</p>
  * <p>Homepage: <a href="http://iharder.net/base64">http://iharder.net/base64</a>.</p>
@@ -714,7 +716,7 @@ public class Base64
      * @throws NullPointerException if source array is null
      * @since 1.4
      */
-    public static String encodeBytes( byte[] source ) {
+    public static String encodeBytes(@NonNull byte[] source ) {
         // Since we're not going to have the GZIP encoding turned on,
         // we're not going to have an java.io.IOException thrown, so
         // we should not force the user to have to catch it.