makefile has a very stupid relation with tabs , all actions of every rule are identified by tabs.
and No 4 spaces dont make a tab , only a tab makes a tab...

to check i use the command
```
cat -e -t -v  makefile_name
```

it shows the presence of tabs with ^I and line endings with $ both are vital to ensure that
dependencies end properly and tabs mark the action for the rules so that they are easily identifiable to the make utility.

```
foo@e:~$ cat -e -t -v  foo.txt
hello$
 from$
^Ithis $
   world$
sureshp@e1:~$ cat foo.txt
hello
 from
	this
   world
foo@e:~$
```