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prompt user to enter a directory name
Check if directory name exists
If it does prompt user again and ask if the contents of the dir can be
+ overwritten.
If it can continue with rest of program 
otherwise loop round again asking the same questions and doing the sam
+e checks again . This bit may need to be run several times depending 
+on whether the user enters an existing dir or not.

use warnings;
use strict;
...
        print if /$dirname/ ;
        return;
}