public String getUnicode(Fitzpatrick fitzpatrick) {
    if (!this.supportsFitzpatrick()) {
      throw new UnsupportedOperationException(
        "Cannot get the unicode with a fitzpatrick modifier, " +
        "the emoji doesn't support fitzpatrick."
      );
    } else if (fitzpatrick == null) {
      return this.getUnicode();
    }
    return this.getUnicode() + fitzpatrick.unicode;
  }
Returns the unicode representation of the emoji associated with the
provided Fitzpatrick modifier.<br>
If the modifier is null, then the result is similar to
{@link Emoji#getUnicode()}

@param fitzpatrick the fitzpatrick modifier or null

@return the unicode representation
@throws UnsupportedOperationException if the emoji doesn't support the
Fitzpatrick modifiers
src/main/java/com/vdurmont/emoji/Emoji.java