(fn capitalize [s]
  (s:gsub "." string.upper 1)) 

(fn uppercase [s]
  (string.upper s))

(fn lowercase [s]
  (string.lower s))

(fn plural [s]
  (.. s :s))

{
 :capitalize {
   :call [:c :cap :capital :capitalize]
   :fun capitalize
   }
 :uppercase {
   :call [:u :upper :uppercase]
   :fun uppercase
   }
 :lowercase {
   :call [:l :lower :lowercase]
   :fun lowercase
   }
 :plural {
   :call [:s :plural :pluralize]
   :fun plural
   }
}