PhpCsFixer\Fixer\ClassNotation\VisibilityRequiredFixer::fixMethodVisibility PHP Method

    private function fixMethodVisibility(Tokens $tokens, $index)
    {
        $this->overrideAttribs($tokens, $index, $this->grabAttribsBeforeMethodToken($tokens, $index));
        // force whitespace between function keyword and function name to be single space char
        $afterToken = $tokens[++$index];
        if ($afterToken->isWhitespace()) {
            $afterToken->setContent(' ');
        }
    }