Revert "done stretch"

This reverts commit 1d28fee.

Author: Droid-An

individual-shell-tools/cat/script-04-stretch.sh

@@ -13,4 +13,4 @@ set -euo pipefail
 # 3 It looked delicious.
 # 4 I was tempted to take a bite of it.
 # 5 But this seemed like a bad idea...
-cat ../ls/child-directory/*  | nl
+# cat -n ../ls/child-directory/*    <<------  not working