This is a port of the original porter2stemmer for .net standard, with unit tests in .net core using nunit 3

porter2-stemmer

An implementation of the Porter2 stemming algorithm in C#

http://snowball.tartarus.org/algorithms/english/stemmer.html

A stemmer helps convert similar words into a common form so that they can be accurately compared, regardless of tense/part of speec/etc.

For example:

friend -> friend  
friendly -> friend  
friends -> friend  
friend's -> friend