diff --git a/examples/wkhtmltopdf.v b/examples/c_interop_wkhtmltopdf.v
similarity index 92%
rename from examples/wkhtmltopdf.v
rename to examples/c_interop_wkhtmltopdf.v
index b5734f648c..98f371b382 100644
--- a/examples/wkhtmltopdf.v
+++ b/examples/c_interop_wkhtmltopdf.v
@@ -1,12 +1,12 @@
 import os
 
 // Example of C interop for a very handy task.
-// 
+//
 // wkhtmltopdf and wkhtmltoimage are open source (LGPLv3) command line tools to
 // render HTML into PDF and various image formats using the Qt WebKit rendering
 // engine. These run entirely "headless" and do not require a display or display
 // service.
-// 
+//
 // https://github.com/wkhtmltopdf/wkhtmltopdf
 // https://wkhtmltopdf.org/downloads.html
 // https://wkhtmltopdf.org/libwkhtmltox/
@@ -23,37 +23,37 @@ fn C.wkhtmltopdf_init(use_graphics bool) int
 
 fn C.wkhtmltopdf_deinit() int
 
-fn C.wkhtmltopdf_version() charptr
+fn C.wkhtmltopdf_version() &char
 
 fn C.wkhtmltopdf_create_global_settings() &C.wkhtmltopdf_global_settings
 
 fn C.wkhtmltopdf_destroy_global_settings(global_settings &C.wkhtmltopdf_global_settings)
 
-fn wkhtmltopdf_set_global_setting(global_settings &C.wkhtmltopdf_global_settings, name charptr, value charptr) bool
+fn wkhtmltopdf_set_global_setting(global_settings &C.wkhtmltopdf_global_settings, name &char, value &char) bool
 
 fn C.wkhtmltopdf_create_object_settings() &C.wkhtmltopdf_object_settings
 
 fn C.wkhtmltopdf_destroy_object_settings(object_settings &C.wkhtmltopdf_object_settings)
 
-fn C.wkhtmltopdf_set_object_setting(object_settings &C.wkhtmltopdf_object_settings, name charptr, value charptr) bool
+fn C.wkhtmltopdf_set_object_setting(object_settings &C.wkhtmltopdf_object_settings, name &char, value &char) bool
 
 fn C.wkhtmltopdf_create_converter(global_settings &C.wkhtmltopdf_global_settings) &C.wkhtmltopdf_converter
 
 fn C.wkhtmltopdf_destroy_converter(converter &C.wkhtmltopdf_converter)
 
-fn C.wkhtmltopdf_add_object(converter &C.wkhtmltopdf_converter, object_settings &C.wkhtmltopdf_object_settings, data charptr)
+fn C.wkhtmltopdf_add_object(converter &C.wkhtmltopdf_converter, object_settings &C.wkhtmltopdf_object_settings, data &char)
 
 fn C.wkhtmltopdf_convert(converter &C.wkhtmltopdf_converter) bool
 
 fn C.wkhtmltopdf_http_error_code(converter &C.wkhtmltopdf_converter) int
 
-fn C.wkhtmltopdf_get_output(converter &C.wkhtmltopdf_converter, data &charptr) int
+fn C.wkhtmltopdf_get_output(converter &C.wkhtmltopdf_converter, data &&char) int
 
 fn main() {
 	// init
 	init := C.wkhtmltopdf_init(0)
 	println('wkhtmltopdf_init: $init')
-	version := C.wkhtmltopdf_version()
+	version := int(C.wkhtmltopdf_version())
 	println('wkhtmltopdf_version: $version')
 	global_settings := C.wkhtmltopdf_create_global_settings()
 	println('wkhtmltopdf_create_global_settings: ${voidptr(global_settings)}')