string iterator

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diff --git a/mcgoron.iterator.base.sld b/mcgoron.iterator.base.sld
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+#| Copyright 2024 Peter McGoron
+ |
+ | Licensed under the Apache License, Version 2.0 (the "License");
+ | you may not use this file except in compliance with the License.
+ | You may obtain a copy of the License at
+ |
+ |     http://www.apache.org/licenses/LICENSE-2.0
+ |
+ | Unless required by applicable law or agreed to in writing, software
+ | distributed under the License is distributed on an "AS IS" BASIS,
+ | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ | See the License for the specific language governing permissions and
+ | limitations under the License.
+ |#
+
+(define-library (mcgoron iterator base)
+  (import (scheme base) (scheme write) (scheme case-lambda) (srfi 128))
+  (export make-iterator-implementation iterator-implementation?
+          make-iterator iterator?
+          get-implementation get-data
+          iterator-at-start iterator-at-end
+          iterator-at-start? iterator-at-end?
+          iterator-advance
+          iterator-ref
+          iterator->index
+          index->iterator
+          iterator=? iterator<? iterator>? iterator<=? iterator>=?)
+  (include "generic-iterator.scm"))
+