Not able to concatenate the values from a dynamic checkbox list to a textbox looping vertically using javascript

I have a dynamic checkbox list and a textbox and a button. On buttonclick,the value in the textbox is the concatenation of selected checkboxes separated by hyphen(-) as below pic 1.(concatenate selected values in horizontal order) enter image description here I want the values to be concatenated as below pic 2(in vertical order). enter image description here

How can this be achieved. Please find my code as below. //
// // // html

js

  function hidecblClaimsCodeDesc() {
            var code = "";
            var desc = "";
            $('input[type=checkbox][id^="CheckBoxList2"]:checked').each(function (index, item) {
                if (code.length == 0) {
                    code = $(item).val();
                    desc = $(item).next("label").text();

                }
                else {
                    code += "," + $(item).val();
                    desc += "-" + $(item).next("label").text();

                }
            });
}