add frozen_string_literal

Gemfile.lock

@@ -0,0 +1,53 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    json (2.8.2)
+    language_server-protocol (3.17.0.3)
+    lint_roller (1.1.0)
+    parallel (1.26.3)
+    parser (3.3.6.0)
+      ast (~> 2.4.1)
+      racc
+    racc (1.8.1)
+    rainbow (3.1.1)
+    regexp_parser (2.9.2)
+    rubocop (1.68.0)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 2.4, < 3.0)
+      rubocop-ast (>= 1.32.2, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.36.1)
+      parser (>= 3.3.1.0)
+    rubocop-performance (1.22.1)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    ruby-progressbar (1.13.0)
+    standard (1.42.1)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.0)
+      rubocop (~> 1.68.0)
+      standard-custom (~> 1.0.0)
+      standard-performance (~> 1.5)
+    standard-custom (1.0.2)
+      lint_roller (~> 1.0)
+      rubocop (~> 1.50)
+    standard-performance (1.5.0)
+      lint_roller (~> 1.1)
+      rubocop-performance (~> 1.22.0)
+    unicode-display_width (2.6.0)
+
+PLATFORMS
+  ruby
+  x86_64-linux
+
+DEPENDENCIES
+  standard (~> 1.31)
+
+BUNDLED WITH
+   2.5.22

day_01/1.rb

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 class Main
   def run