add another check to separate existing files from nonexistent paths

Author: Boshra Mahmoudi

implement-shell-tools/ls/ls.py

@@ -29,5 +29,8 @@
         print(file, end="  ")
       print()
 
+  elif os.path.isfile(path):
+    print(path)
+
   else:
-    print(path)
+    print(f"{path}: No such file or directory")