bash substititution didn't work for my /bin/sh

install

@@ -9,7 +9,9 @@ if ! command -v path-wizard > /dev/null 2>&1; then
 		$SCRIPT_DIR/spells/path-wizard add $SCRIPT_DIR/spells/cantrips
 		$SCRIPT_DIR/spells/path-wizard add $SCRIPT_DIR/spells/menu
 		$SCRIPT_DIR/spells/path-wizard add $SCRIPT_DIR/spells/menu/bitcoin
-		echo "Your spellbook has been activated, please open a fresh terminal now."
+        echo ""
+		echo "Activating your spellbook now."
+        $SHELL
 		exit 0
 	else
 		echo "Ok, well the mud won't work until you install it by adding the spells directory to your PATH."

spells/path-wizard

@@ -32,7 +32,7 @@ else
     directory=$(pwd -P)
   else
     # If the directory is a relative path, convert it to an absolute path
-    if [ "${directory:0:1}" != "/" ]; then
+    if [ "$(echo $directory | cut -c1)" != "/" ]; then
       directory=$(cd "$directory" && pwd -P)
     fi
   fi