stop using shared dir

lib/mcp/string_utils.rb

@@ -0,0 +1,26 @@
+# typed: strict
+# frozen_string_literal: true
+
+module MCP
+  module StringUtils
+    extend self
+
+    def handle_from_class_name(class_name)
+      underscore(demodulize(class_name))
+    end
+
+    private
+
+    def demodulize(path)
+      path.to_s.split("::").last || path.to_s
+    end
+
+    def underscore(camel_cased_word)
+      camel_cased_word.dup
+        .gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
+        .gsub(/([a-z\d])([A-Z])/, '\1_\2')
+        .tr("-", "_")
+        .downcase
+    end
+  end
+end