function solve() {

   let [button1,button2,button3]=document.querySelectorAll('.add-product');
   let textArea=document.getElementsByTagName('textarea')[0];
   let checkoutBtn=document.querySelector('.checkout');
   let [name1,name2,name3]=document.querySelectorAll('.product-title');
   let [price1,price2,price3]=document.querySelectorAll('.product-line-price');
   let boughtNames=[];
   let totalPrice=0;

   button1.addEventListener('click',()=>{
      textArea.textContent+=`Added ${name1.textContent} for ${price1.textContent} to the cart.\n`;
      if(!boughtNames.includes(name1.textContent)){
         boughtNames.push(name1.textContent);
      }
      totalPrice+=Number(price1.textContent);
   });

   button2.addEventListener('click',()=>{
      textArea.textContent+=`Added ${name2.textContent} for ${price2.textContent} to the cart.\n`;
      if(!boughtNames.includes(name2.textContent)){
         boughtNames.push(name2.textContent);
      }
      totalPrice+=Number(price2.textContent);
   });

   button3.addEventListener('click',()=>{
      textArea.textContent+=`Added ${name3.textContent} for ${price3.textContent} to the cart.\n`;
      if(!boughtNames.includes(name3.textContent)){
         boughtNames.push(name3.textContent);
      }
      totalPrice+=Number(price3.textContent);
   });

   checkoutBtn.addEventListener('click',()=>{
      let buttons=document.querySelectorAll('.add-product');
      for (let i = 0; i < buttons.length; i++) {
         buttons[i].disabled = true;
      }
      textArea.textContent+=`You bought ${boughtNames.join(', ')} for ${totalPrice.toFixed(2)}.`
   });
}