Move internal modules to “internal” folder.

.internal/initCloneObject.js

@@ -0,0 +1,18 @@
+import baseCreate from './.internal/baseCreate.js';
+import getPrototype from './.internal/getPrototype.js';
+import isPrototype from './.internal/isPrototype.js';
+
+/**
+ * Initializes an object clone.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+function initCloneObject(object) {
+  return (typeof object.constructor == 'function' && !isPrototype(object))
+    ? baseCreate(getPrototype(object))
+    : {};
+}
+
+export default initCloneObject;