How to extract document name without defined dosument typy in Power Query

Hi

I am trying to extract document names without defined document type string in document name. I have tried with lists etc without solution. 

Any ideas how this is possible to do in Power Query, please see simple example below, where original name is document name with document type in it, document type in separate column and modified name what I like to have. In other words, if document name includes document type in it, I would like add new column as "name without document type- string".