Get values from checkbox and send them to input text

const groupInput1 = document.getElementsByName('glassLeistung');
 const output = document.getElementById('glassType');
 const go = document.getElementById('go');
 
  go.addEventListener("click", event => {
    output.value=''
    for (let i = 0; i < groupInput1.length; i++) {
       if (groupInput1[i].checked) {
           console.log(groupInput1[i].value);
           output.value = output.value + groupInput1[i].value + ' '
       }

    }
  })

<input type="checkbox" class="selected" id="glass" name="glassLeistung"
value="Glass" autocomplete="off">
                                                       
<input type="checkbox" id="rahmen" class="selected" name="glassLeistung"
value="Rahmen" autocomplete="off">
                                                       
<input type="checkbox" id="falzen" class="selected" name="glassLeistung"
value="Falzen" autocomplete="off">



<input type="text" name="glassType-420" value="" size="40"  id="glassType" aria-invalid="false">

<button id="go">go</button>