Update Makefile

Makefile

@@ -1,17 +1,18 @@
 SHELL=/bin/bash
 
+# The cron job you want to add
+NEW_CRON="0 3 * * * $(shell pwd)/main.sh"
+
 run-script:
     # run the main script
     main.sh
 
 install:
-    # Add entry in crontab
-    # The cron job you want to add
-    NEW_CRON="0 3 * * * $(shell pwd)/main.sh"
+    # Add entry in crontab    
     # Check if it already exists (to avoid duplicates)
-    ( crontab -l 2>/dev/null | grep -F "$NEW_CRON" ) && echo "Cron already exists." && exit 0
+    ( crontab -l 2>/dev/null | grep -F "$(NEW_CRON)" ) && echo "Cron already exists." && exit 0
     # Add the new cron safely
-    ( crontab -l 2>/dev/null; echo "$NEW_CRON" ) | crontab -
+    ( crontab -l 2>/dev/null; echo "$(NEW_CRON)" ) | crontab -
 
 requirements:
     # Add the necessary packages