remove spaces around index

Author: Piyush Sharda

.github/workflows/burn_cell_metal_chem.yml

@@ -71,7 +71,7 @@ jobs:
             ref_file="${ref_map[$Z]}"
 
             error_found=false
-            index = 0
+            index=0
             for line_number in $line_numbers; do
               value1=$(awk 'NR=='"$line_number"' {match($0, /[+-]?[0-9]+([.][0-9]+)?[eE]?[+-]?[0-9]+/); if (RSTART) print substr($0, RSTART, RLENGTH); else print 0}' $output_file)