No.
With ddrescue, you do not (want to) create a new filesystem directly on
the new device.
What you want to do is create a filesystem _image_, in a file which is
stored on the new device.
Step-by-step, what you do is:
* Create a filesystem on your "good" drive (/dev/sdc). You can use any
filesystem you want.
* Mount the newly created filesystem somewhere. For example, if you want
to mount it to the empty directory '/mnt/new_disk', you could run the
command:
mount /dev/sdc1 /mnt/new_disk
* Run the command
ddrescue /dev/sdb /mnt/new_disk/sdb_failed.img
/tmp/sdb_failed.ddrescuelog
Note that this will create _two_ files: the rescued filesystem image,
and a "log file" which ddrescue uses to keep track of what it has
already successfully rescued and where it has encountered errors. This
second file will take up additional space.