added comments as to why I used substring(1) and added an '@' before record ID

Author: Alagu Ganesan

src/main/kotlin/biokotlin/seqIO/FastqIO.kt

@@ -153,7 +153,7 @@ fun writeFastq(input: Collection<SeqRecord>, filename: String) {
                 is NucSeqRecord -> record.sequence.toString()
                 else -> throw IllegalStateException("writeFastq trying to output something other than Nuc Seq.")
             }
-            outputFile.write("@${record.id}\n")
+            outputFile.write("@${record.id}\n") // adding @ to record because when using FastqIO iterator removes @ from original header
             outputFile.write("${seq}\n")
             outputFile.write("+\n")
             require (record.letterAnnotations["quality"]?.size != 0) { "Letter annotations cannot be empty" }

src/test/kotlin/biokotlin/seqIO/FastqIOTest.kt

@@ -90,7 +90,7 @@ class FastqIOTest : StringSpec({
                 letterAnnotationsImmutableMapBuilder.putAll(letterAnnotations)
                 val immutableLetterAnnotations = letterAnnotationsImmutableMapBuilder.build()
 
-                val fastqEntry = NucSeqRecord(NucSeq(sequence), header.substring(1), "", "", immutableAnnotations, immutableLetterAnnotations)
+                val fastqEntry = NucSeqRecord(NucSeq(sequence), header.substring(1), "", "", immutableAnnotations, immutableLetterAnnotations) // doing header.substring(1) becuase FastqIO iterator removes @ symbol
                 fastqEntries.add(fastqEntry)
             }
         }