Index Stemming to process text in c sharp or ruby

Question

Given this text:

"Friends are friendlier friendlies that are friendly and classify the friendly classification class. Flowery flowers flow through following the flower flows"

I need to apply stemming to the text to achieve the following outcome:

frequency("following")                = 1
frequency("flow")                     = 2
frequency("classification")           = 1
frequency("class")                    = 1
frequency("flower")                   = 3
frequency("friend")                   = 4
frequency("friendly")                 = 4
frequency("classes")                  = 1

As we interface with the FAST search engine. FAST indexes content to provide relevant search results to a query. One aspect of indexing is stemming and we need to use either c sharp or ruby to solve this.

Would appreciate anyones views on the best approach