code: private function fixFunctionCall(Tokens $tokens, $index)
      {
          // remove space before opening brace
          if ($tokens[$index - 1]->isWhitespace()) {
              $tokens->clearAt($index - 1);
          }
      }
docs: Fixes whitespaces around braces of a function(y) call.
  
  @param Tokens $tokens tokens to handle
  @param int    $index  index of token