Extract directory setup to a private method

Author: rafaelfranca

lib/benchmark_suite.rb

@@ -31,14 +31,7 @@ def initialize(ruby:, ruby_description:, categories:, name_filters:, out_path:,
     @no_pinning = no_pinning
     @ractor_only = (categories == RACTOR_ONLY_CATEGORY)
 
-    @bench_dir = BENCHMARKS_DIR
-    @ractor_bench_dir = RACTOR_BENCHMARKS_DIR
-
-    if @ractor_only
-      @bench_dir = @ractor_bench_dir
-      @harness = RACTOR_HARNESS
-      @categories = []
-    end
+    setup_benchmark_directories
   end
 
   # Run all the benchmarks and record execution times
@@ -69,6 +62,18 @@ def run
 
   private
 
+  def setup_benchmark_directories
+    if @ractor_only
+      @bench_dir = RACTOR_BENCHMARKS_DIR
+      @ractor_bench_dir = RACTOR_BENCHMARKS_DIR
+      @harness = RACTOR_HARNESS
+      @categories = []
+    else
+      @bench_dir = BENCHMARKS_DIR
+      @ractor_bench_dir = RACTOR_BENCHMARKS_DIR
+    end
+  end
+
   def process_benchmark_result(result_json_path, command)
     JSON.parse(File.read(result_json_path)).tap do |json|
       json["command_line"] = command