function solve() {
   let makeEl = document.getElementById("make");
   let modelEl = document.getElementById("model");
   let yearEl = document.getElementById("year");
   let fuelEl = document.getElementById("fuel");
   let priceEl = document.getElementById("original-cost");
   let sellEl = document.getElementById("selling-price");

   let publishBtn = document.getElementById("publish");
   let currDif = 0;

   publishBtn.addEventListener("click", publish);
   function publish(e) {
     e.preventDefault();

     if (makeEl.value === ""
     || modelEl.value === ""
     || yearEl.value === ""
     || priceEl.value === ""
     || sellEl.value === ""
     || fuelEl.value === "") {
       return
     };

     if (priceEl.value < 0 || sellEl.value < 0 || priceEl.value >= sellEl.value) {
       return;
     }

     let make = makeEl.value;
     let model = modelEl.value;
     let year = yearEl.value;
     let fuel = fuelEl.value;
     let price = priceEl.value;
     let sell = sellEl.value;

     let tBody = document.getElementById("table-body");
     let row = document.createElement("tr");
    // row.setAttribute("class", "row")
     //row.classList.add("row")
     row.className = "row"

     let tdMake = document.createElement("td");
     tdMake.textContent = make;

     let tdModel = document.createElement("td");
     tdModel.textContent = model;

     let tdYear = document.createElement("td");
     tdYear.textContent = year;

     let tdFuel = document.createElement("td");
     tdFuel.textContent = fuel;

     let tdPrice = document.createElement("td");
     tdPrice.textContent = price;

     let tdSell = document.createElement("td");
     tdSell.textContent = sell;

     let tdBtns = document.createElement("td");                             //change 1
     let editBtn = document.createElement("button");
     editBtn.textContent = "Edit";
     editBtn.className = "action-btn edit"

     let sellBtn = document.createElement("button");
     sellBtn.textContent = "Sell";
     sellBtn.className = "action-btn sell"

     row.appendChild(tdMake);
     row.appendChild(tdModel);
     row.appendChild(tdYear);
     row.appendChild(tdFuel);
     row.appendChild(tdPrice);
     row.appendChild(tdSell);
     tdBtns.appendChild(editBtn);                                           //change 1
     tdBtns.appendChild(sellBtn);                                           //change 1
     row.appendChild(tdBtns);                                               //change 1

     tBody.appendChild(row);

     makeEl.value = ""
     modelEl.value = ""
     yearEl.value = ""
     fuelEl.value = ""
     priceEl.value = ""
     sellEl.value = ""

     editBtn.addEventListener("click", edit)

     function edit(e) {

       document.getElementsByClassName("action-btn edit").disabled = true;
       makeEl.value = make;
       modelEl.value = model;
       yearEl.value = year;
       fuelEl.value = fuel;
       priceEl.value = price;
       sellEl.value = sell;
       row.parentNode.removeChild(row);                                     //change 2
     }

     sellBtn.addEventListener("click", sellComm)

     function sellComm(e) {
       let ul = document.getElementById("cars-list");
       let li = document.createElement("li");
       li.className = "each-list"
       let span1 = document.createElement("span");
       span1.textContent = `${make} ${model}`;

       let span2 = document.createElement("span");
       span2.textContent = year;

       let span3 = document.createElement("span");
       span3.textContent = Number(sell) - Number(price);

       li.appendChild(span1);
       li.appendChild(span2);
       li.appendChild(span3);
       ul.appendChild(li);                                                  //change 3
       let profitField = document.getElementById("profit")
       let difference = Number(sell) - Number(price);
       currDif += difference
       profitField.textContent = currDif.toFixed(2)                         //change 4
       row.parentNode.removeChild(row);                                     //change 2
     }
   }
 }