code: @NonNull
      public static String scopeCollectionToString(@NonNull Collection<Scope> scopes) {
          Set<String> stringSet = scopeCollectionToStringSet(scopes);
          return TextUtils.join(" ", stringSet).toLowerCase();
      }
docs: Converts a {@link Collection} of {@link Scope}s into a space-delimited {@link String}.
  
  @param scopes the {@link Collection} of {@link Scope}s to convert
  @return a space-delimited {@link String} of {@link Scope}s