@ReviseWhenPortedToJDK(value = "11", description = "Character.toString(aChar).repeat(count)")
  @Contract(pure = true)
  public static @NotNull String repeatSymbol(char aChar, int count) {
    char[] buffer = new char[count];
    Arrays.fill(buffer, aChar);
    return new String(buffer);
  }
@ReviseWhenPortedToJDK(value = "11", description = "Character.toString(aChar).repeat(count)")
  @Contract(pure = true)
  public static @NotNull String repeatSymbol(char aChar, int count)