Slashcommand handler acting weird

[epicskillz]

function SlashPMS(msg, editbox)
  print("Entered /command handler " .. msg)
  PMSEncode(msg)
end

SLASH_PMS1 = "/pms";
SlashCmdList["PMS"] = SlashPMS;



--[[local function PMSEncode(msg)
  endResult = ""
  if msg == "" then
    print "Blank string."
  else
    print(string.len(msg))
    for i = 1, string.len(msg)-1, 1
      print("i")
--      encode = endResult .. PMSLetterEncoded(string.sub(msg,i,i+1) .. " "
    end
  end
  
  SendChatMessage(endResult, "SAY", "", "");
end 

local function PMSLetterEncoded(s)
  if s:len() > 1 then 
    return "0"
  else 
    return "1" -- here be the magic for output
  end
end

local function echo(str)
  print("|cfffef00fPMS |cff82e2eb" .. (str or ""))
end
--]]

I'm trying to make an addon that can "encode" your /say things. One day I might even implement a decoder, but that is a long way off.

First of all, as you see now, EVERYTHING except the slashhandler is commented out. Then it works.

If i do as little as uncomment the 3 functions, i just get /pms not recognized.

(Yes, PMS means Panzer's Messaging System. I also thought it was hilarious..)

Any help please?

My addon needs no GUI, my plan was to write /pms <any text> , and it would come out in /say as encoded text. Will that need any events(handlers)? I have somewhat experience with programming, but only been using lua for 40 mins, and never seen event-driven programming, so bare with me.