Add sample for text version of chunked

libraries/stdlib/samples/test/samples/text/strings.kt

@@ -49,6 +49,15 @@ class Strings {
         assertPrints(withoutMargin2, "XYZ\nfoo\nbar")
     }
 
+    @Sample
+    fun chunked() {
+        val dnaFragment = "ATTCGCGGCCGCCAA"
+
+        val codons = dnaFragment.chunked(3)
+
+        assertPrints(codons, "[ATT, CGC, GGC, CGC, CAA]")
+    }
+
     @Sample
     fun chunkedTransform() {
         val codonTable = mapOf("ATT" to "Isoleucine", "CAA" to "Glutamine", "CGC" to "Arginine", "GGC" to "Glycine")