code: @Nonnull
    public static String replaceMultipleAsString (@Nullable final String sInputString,
                                                  @Nonnull final char [] aSearchChars,
                                                  final char cReplacementChar)
    {
      ValueEnforcer.notNull (aSearchChars, "SearchChars");
  
      if (hasNoText (sInputString))
        return "";
  
      final StringBuilder aSB = new StringBuilder (sInputString.length ());
      replaceMultipleTo (sInputString, aSearchChars, cReplacementChar, aSB);
      return aSB.toString ();
    }
docs: Optimized replace method that replaces a set of characters with another
  character. This method was created for efficient unsafe character
  replacements!
  
  @param sInputString
  The input string.
  @param aSearchChars
  The characters to replace.
  @param cReplacementChar
  The new char to be used instead of the search chars.
  @return The replaced version of the string or an empty char array if the
  input string was <code>null</code>.
  @since 8.6.3