def layouts(*args)
      args.concat(%i[fast unsort small large]) if args.map(&:to_s).include?('all')
      args = args.map(&:to_s).join('|')
      res = ''
      res += fastbin.map(&:inspect).join if args.include?('fast')
      res += unsorted_bin.inspect if args.include?('unsort')
      res += smallbin.map(&:inspect).join if args.include?('small')
      res
    end
def layouts(*args)
      args.concat(%i[fast unsort small large]) if args.map(&:to_s).include?('all')
      args = args.map(&:to_s).join('|')
      res = ''
      res += fastbin.map(&:inspect).join if args.include?('fast')
      res += unsorted_bin.inspect if args.include?('unsort')
      res += smallbin.map(&:inspect).join if args.include?('small')
      res
    end
Pretty dump of bins layouts.

 @param [Symbol] args Bin type(s) you want to see.
 @return [String] Bin layouts that wrapper with color codes.
 @example
   puts h.libc.main_arena.layouts(:fast, :unsorted, :small)
   puts h.libc.main_arena.layouts(:all)