now using String refinement

lib/voicemeeter/cbindings.rb

@@ -1,10 +1,11 @@
 module Voicemeeter
   # Ruby bindings for the C-API functions
   module CBindings
-    private
-
     extend Logging
     extend FFI::Library
+    using Util::CoreExtensions
+
+    private
 
     VM_PATH = Install.get_vmpath
 
@@ -14,7 +15,7 @@ module Voicemeeter
     ffi_convention :stdcall
 
     private_class_method def self.attach_function(c_name, args, returns)
-      ruby_name = :"bind_#{Util::String.snakecase(c_name.to_s.delete_prefix("VBVMR_"))}"
+      ruby_name = :"bind_#{c_name.to_s.delete_prefix("VBVMR_").snakecase}"
       super(ruby_name, c_name, args, returns)
     end
 
@@ -52,8 +53,7 @@ module Voicemeeter
 
     def call(fn, *args, ok: [0], exp: nil)
       to_cname = -> {
-        "VBVMR_#{Util::String.camelcase(fn.to_s.delete_prefix("bind_"))
-        .gsub(/(Button|Input|Output)/, '\1_')}"
+        "VBVMR_#{fn.to_s.delete_prefix("bind_").camelcase.gsub(/(Button|Input|Output)/, '\1_')}"
       }
 
       res = send(fn, *args)

lib/voicemeeter/util.rb

@@ -1,8 +1,9 @@
 module Voicemeeter
   module Util
-    module String
-      def snakecase(s)
-        s.gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
+    module CoreExtensions
+      refine String do
+        def snakecase
+          gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
             .gsub(/([a-z\d])([A-Z])/, '\1_\2')
             .tr("-", "_")
             .gsub(/\s/, "_")
@@ -10,12 +11,11 @@ module Voicemeeter
             .downcase
         end
 
-      def camelcase(s)
-        s if s !~ /_/ && s =~ /[A-Z]+.*/
-        s.split("_").map { |e| e.capitalize }.join
+        def camelcase
+          self if self !~ /_/ && self =~ /[A-Z]+.*/
+          split("_").map(&:capitalize).join
+        end
       end
-
-      module_function :snakecase, :camelcase
     end
 
     module Cache