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How to rename and move files to new directory
FOR  /R C:your_folder %%d  IN  (*.txt)  DO  (
    ren %%d %%~nd.txt_mvd
)

FOR  /R E:your_folder %%d  IN  (*.*)  DO  (
    IF %%~dpd==E:your_folder (
        ren %%d %%~nd.txt_mvd
    )
)

FOR  /R E:your_folder %%d  IN  (*.txt)  DO  (
    IF %%~dpd==E:your_folder (
        ren %%d %%~nd.txt_mvd
    )
)

set Extension_of_file_you_want_to_renamne_and_move=txt
set New_extension_of_moved_files=txt_mvd

set Folder_that_contain_your_files=C:Your_starting_folder
set Folder_where_to_move_your_files=C:Your_destnation_folder

FOR  /R %Folder_that_contain_your_files% %%d  IN  (*.%Extension_of_file_you_want_to_renamne_and_move%)  DO  (
    IF %%~dpd==%Folder_that_contain_your_files% (
    IF %%~xd==.%Extension_of_file_you_want_to_renamne_and_move% (
        ren "%%~d" "%%~nd.%New_extension_of_moved_files%"
        move "%%~dpnd.%New_extension_of_moved_files%" "%Folder_where_to_move_your_files%"
        )
    )
)

set Folder_that_contain_your_files = c:myFolder      <--- WRONG, WON'T WORK, there are unneeded space

set Folder_that_contain_your_files=c:myFolder      <--- OK, THIS WILL WORK, there are no extra spaces

set Extension_of_file_you_want_to_renamne_and_move=txt
set New_extension_of_moved_files=txt_mvd

set Folder_that_contain_your_files=C:Your_starting_folder
set Folder_where_to_move_your_files=C:Your_destnation_folder

FOR  /R "%Folder_that_contain_your_files%" %%d  IN  (*.%Extension_of_file_you_want_to_renamne_and_move%)  DO  (
    IF "%%~dpd"=="%Folder_that_contain_your_files%" (
    IF %%~xd==.%Extension_of_file_you_want_to_renamne_and_move% (
        ren "%%~d" "%%~nd.%New_extension_of_moved_files%"
        move "%%~dpnd.%New_extension_of_moved_files%" "%Folder_where_to_move_your_files%"
        )
    )
)