Merge pull request #5083 from wataash/example-clarify-caller

examples/mrbgems: clarify the caller

examples/mrbgems/c_and_ruby_extension_example/mrblib/example.rb

 module CRubyExtension
   def CRubyExtension.ruby_method
-    puts "A Ruby Extension"
+    puts "#{self}: A Ruby Extension"
   end
 end

examples/mrbgems/c_and_ruby_extension_example/src/example.c

 #include <mruby.h>
+#include <mruby/string.h>
 #include <stdio.h>
 
 static mrb_value
 mrb_c_method(mrb_state *mrb, mrb_value self)
 {
-  puts("A C Extension");
+  mrb_value self_str = mrb_str_to_str(mrb, self);
+
+  printf("%s: A C Extension\n", mrb_str_to_cstr(mrb, self_str));
+
   return self;
 }
 

examples/mrbgems/c_extension_example/src/example.c

 #include <mruby.h>
+#include <mruby/string.h>
 #include <stdio.h>
 
 static mrb_value
 mrb_c_method(mrb_state *mrb, mrb_value self)
 {
-  puts("A C Extension");
+  mrb_value self_str = mrb_str_to_str(mrb, self);
+
+  printf("%s: A C Extension\n", mrb_str_to_cstr(mrb, self_str));
+
   return self;
 }
 

examples/mrbgems/ruby_extension_example/mrblib/example.rb

 class RubyExtension
   def RubyExtension.ruby_method
-    puts "A Ruby Extension"
+    puts "#{self}: A Ruby Extension"
   end
 end