Shorten names of files (Removing part of the name)
Remove first part of a file name in batch: eg string to remove= "csc 123 computer science"
csc 123 computer science lec 1 --> lec 1
csc 123 computer science lec 1 --> lec 2
csc 123 computer science lec 1 --> lec 3
csc 123 computer science lec 1 --> lec 4
csc 123 computer science lec 1 --> lec 5