Update alienTrimmer.rules

workflow/rules/alienTrimmer.rules

@@ -59,7 +59,7 @@ rule alienTrimmer:
         # paired end or single end
         if [[ ${{#infiles[@]}} -eq 2 ]];
         then
-            cmd+="-1 ${{infiles[0]}} -2 ${{infiles[1]}} -o out_paired"
+            cmd+=" -1 ${{infiles[0]}} -2 ${{infiles[1]}} -o out_paired"
         else
             cmd+=" -i ${{infiles[0]}} -o out_single"
         fi