tweak functionality

bin/compile

@@ -6,13 +6,11 @@ indent() {
 
 echo "-----> Found a hello.txt"
 
-# if hello.txt has contents, display them (indented to align)
-# otherwise error
-
+# if hello.txt is empty, abort the build
 if [ ! -s $1/hello.txt ]; then
   echo "hello.txt was empty" | indent
   exit 1
-else
-  echo "hello.txt is not empty, here are the contents" | indent
-  cat $1/hello.txt | indent
 fi
+
+# replace hello with goodbye in a new file
+cat $1/hello.txt | sed -e "s/[Hh]ello/Goodbye/g" > $1/goodbye.txt