@Nonnull
	public static String fillRight(int len, @Nonnull String pattern, @Nullable String string) {
		StringBuilder sb = new StringBuilder(string == null ? "" : string);
		while (sb.length() < len)
			sb.append(pattern);
		return sb.toString();
	}
@param len
		Target string length.
@param pattern
		Pattern to fill with.
@param string
		Initial string.

@return String with pattern filling up to the desired length on the right.
recaf-core/src/main/java/software/coley/recaf/util/StringUtil.java