kotlin extension

packages/kotlin/1.4.31/compile

@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
 
 # Put instructions to compile source code, remove this file if the language does not require this stage
-kotlinc "$@" -include-runtime -d code.jar
+
+rename 's/$/\.kt/' "$@" # Add .kt extension
+
+kotlinc *.kt -include-runtime -d code.jar