Fills Japanese iteration marks (Odori-ji) with their previous characters if the element has more than 5 characters.
Examples
strj_fill_iter_mark(c(
"\u3042\u3044\u3046\u309d\u3003\u304b\u304d",
"\u91d1\u5b50\u307f\u3059\u309e",
"\u306e\u305f\u308a\u3033\u3035\u304b\u306a",
"\u3057\u308d\uff0f\u2033\uff3c\u3068\u3057\u305f"
))
#> [1] "あいうううかき" "金子みすず" "のたりたりかな" "しろじろとした"