function solve () {


      class Storage {

        constructor (capacity) {

         this.capacity = capacity;

          this.arr = [];

          this.totalCost = 0;

        }


        addProduct (obj) {

          this.arr.push(JSON.stringify(obj));

          this.capacity -= obj.quantity;

          this.totalCost += obj.price * obj.quantity;

         }

          getProducts() {

            const stringified = this.arr.map((item) => JSON.stringify(item));

            let valueToReturn = '';

            stringified.forEach((item) => (valueToReturn === '' ? valueToReturn += `${item}` : valueToReturn += `\n${item}`));

            return valueToReturn;

         }



      }