local title = function (str)
   str = tostring(str)

   local cap = string.upper(str:sub(1, 1))
   return cap .. str:sub(2, -1)
end

local butt = {"john", "jacob", "jingleheimer schmidt"}

local output = ""

for i, name in ipairs(butt) do
   output = output .. title(name)
   if i < #butt then
      output = output .. ", "
   end
end

print(output)