How can I pass user input value to vimgrep?

I am trying to write a small script to mimic the Notepad++ 's 'Find in Files'
feature.
First it collects information from the user e.g. search item, directory and
file-type,
then it should start performing.
I got stumbled somewhere, after searching the Internet a lot
I did not find any solution that worked in my case.
Here is the detail:

" ------------Find_in_Files.vim------------
" -----------------------Implementation of a simple feature
" -----------------------"Find in Files and Directories"
" -----------------------like Notepad++ -----------------


:menu Edit.Find\ in\ Files :<Esc>:<Esc>:call Find_in_Files() <Cr>

function Find_in_Files()

" -----------------------raw method-----------------
" :vimgrep /GNU/ C:\CodeBlocks\TDM-GCC-64\include\*.txt
" :cw
" --------------------------------------------------

let what2find = inputdialog("search term", "", "cancel pressed")
let directory = browsedir("Browse the directory","")
let filetype = inputdialog("filetype", "", "cancel pressed")
if what2find != "" && what2find != "cancel pressed" && directory != ""
&& filetype != ""


" :exe "!vimgrep /".what2find "\b/" " " .directory "\b\*." .filetype
" not working
:execute "vimgrep /".what2find "\b/" " " .directory "\b\*."
.filetype
:cw
" also not working

else
"process if user press okay
if what2find != "cancel pressed" && directory != "cancel pressed"
&& filetype != "cancel pressed"
" I will repeat the same here if something goes well
endif
endif
endfunction



This plug-in is working partially, all the problem comes when I pass a
variable value from the user input to vimgrep.
If there is any fix to this problem please let me know.





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