Improve json template looping in variable instead of tmp files

transform_json.sh

@@ -12,13 +12,10 @@ j=1
 for i in $rWallets; do
 	! [[ $j =~ ^(0|1)$ ]] && ((j--))
         if [[ $j == 1 ]]; then
-                dateN=$i
-                cp tpl/graph.json rWallets-$i.json
-                sed -i s/_DATE/$i/g rWallets-$i.json
+                jsonTPL=$(sed s/_DATE/$i/g tpl/graph.json)
                 j=0
         elif [[ $j == 0 ]]; then
-                result+=$(sed s/_RWALLET/$i/g rWallets-$dateN.json)
-                rm rWallets-$dateN.json
+                result+=$(sed s/_RWALLET/$i/g <<< $jsonTPL)
 		[[ $n == 1 ]] && j=1 || j=$((n*2))
         fi
 done