diff -u basicinterpreter.pl basicinterpreter_fixed.pl 
--- basicinterpreter.pl	2021-08-11 15:51:20.359658237 +0200
+++ basicinterpreter_fixed.pl	2021-08-11 16:01:08.724748447 +0200
@@ -28,6 +28,8 @@
 
 while (<$fIn>) {
     chomp;
+    s/\r//g;
+    s/\n//g;
     next if /^#/;
 
     my ($lineNum, $line) = /^(\d+)\s+(.*)/;