update

src/utils.jl

@@ -604,12 +604,13 @@ julia> headers = ["Thought", "Act"]
 function replaceHeaders(text::T, headers, step::Int) where {T<:AbstractString}
   newtext = text
   for i in headers
-    header = i[:char][1:end-1]
+    header = i[1:end-1]  # not include ":"
     if occursin(header, newtext)
-      startind = findfirst(i[:char], newtext)[1]
+      startind = findfirst(header, newtext)[1]
       stopind = findnext(":", newtext, startind+1)[end]
       word = newtext[startind: stopind]
-      newtext = replace(newtext, word=> "$header $step:")
+      newword = "$header $step:"
+      newtext = replace(newtext, word=> newword)
       
     end
   end