would you give me a hand with a simple 'if' bash script?

[hawa]

Execuse me, would you give me a hand with a simple 'if' bash script?
I want to make folders "00", "01",...,"20" and
copy existing files file_00, file_01,....,file_20 to each folder.
Thank you very much.



-------------------------------------
for ((  i = 1 ;  i <= 20;  i++  ))
do

if [ $i -gt 10 ]; then          foldername = $i
        filename = "file_"
        filename = $filename$i
else
        foldername = "0"$i   ##
        filename ="file_0"   ##
        file = $filename$i   ##
fi

done
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