Remove Outermost Parentheses

var paren = "(()())(())(()(()))";
    var result = "";
    var cur = "";
    var counter = 0;
    for(i=0;i<paren.length;i++)
    {
        if(paren[i] === '(')
        {
            counter++;
            if(counter > 1){
                cur += '(';
            }
        }else{
            counter--;
            if(counter === 0){
                result += cur;
                cur = "";
            }else{
                cur += ')';
            }
        }
    }
    console.log(result);