update single-end part of code

workflow/main.nf

@@ -31,7 +31,7 @@ Channel
   }
   .groupTuple(sort: true)
   .map { id, files -> tuple(id, files[0],files[1])}
-  .set { read_pairs }
+  .set { read_pe }
   }
 if (params.pairs == 'se') {
 Channel
@@ -43,7 +43,7 @@ Channel
   }
   .groupTuple(sort: true)
   .map { id, files -> tuple(id, files[0])}
-  .set { read_pairs }
+  .set { read_se }
   }
 
 /*
@@ -94,7 +94,7 @@ def readPrefix( Path actual, template ) {
 //
 process trimpe {
   input:
-  set pair_id, file(read1), file(read2) from read_pairs
+  set pair_id, file(read1), file(read2) from read_pe
   output:
   set pair_id, file("${read1.baseName.split("\\.", 2)[0]}_val_1.fq.gz"), file("${read2.baseName.split("\\.", 2)[0]}_val_2.fq.gz") into trimpe
   when:
@@ -107,7 +107,7 @@ process trimpe {
 }
 process trimse {
   input:
-  set pair_id, file(read1) from read_pairs
+  set pair_id, file(read1) from read_se
   output:
   set pair_id, file("${read1.baseName.split("\\.", 2)[0]}_trimmed.fq.gz") into trimse
   when: