def load_dir(src_dir)
      merged_content = ""

      Pathname.glob("#{src_dir}/*.yml").sort.each do |yaml_path|
        content = yaml_path.read.gsub(/^---$/, "")
        merged_content << content
      end

      YAML.load(merged_content)
    end
def load_dir(src_dir)
      merged_content = ""

      Pathname.glob("#{src_dir}/*.yml").sort.each do |yaml_path|
        content = yaml_path.read.gsub(/^---$/, "")
        merged_content << content
      end

      YAML.load(merged_content)
    end
load divided yaml files
 @param src_dir [String] divided yaml dir
 @return [Hash] merged yaml hash