Move internal modules to “internal” folder.

.internal/createPadding.js

@@ -0,0 +1,33 @@
+import baseRepeat from './.internal/baseRepeat.js';
+import baseToString from './.internal/baseToString.js';
+import castSlice from './.internal/castSlice.js';
+import hasUnicode from './.internal/hasUnicode.js';
+import stringSize from './.internal/stringSize.js';
+import stringToArray from './.internal/stringToArray.js';
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+const nativeCeil = Math.ceil;
+
+/**
+ * Creates the padding for `string` based on `length`. The `chars` string
+ * is truncated if the number of characters exceeds `length`.
+ *
+ * @private
+ * @param {number} length The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padding for `string`.
+ */
+function createPadding(length, chars) {
+  chars = chars === undefined ? ' ' : baseToString(chars);
+
+  const charsLength = chars.length;
+  if (charsLength < 2) {
+    return charsLength ? baseRepeat(chars, length) : chars;
+  }
+  const result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
+  return hasUnicode(chars)
+    ? castSlice(stringToArray(result), 0, length).join('')
+    : result.slice(0, length);
+}
+
+export default createPadding;