Update uwuw_preproc

Andy, I discovered a problem with check_matname function which you edited!. my original one is tied to other functions that splits the group name and extracts material name and density; mat_dens_split & mat_split, when you edited it you added some "Exceptions" - which I think already done within the splitting process- but you kept the references to the original splitting functions as is which give and error when trying to run