text: function solve(input) {
  
      let fuelType = input[0];
      let litres = Number(input[1]);
  
      if (fuelType !== "Diesel" && fuelType !== "Gasoline" && fuelType !== "Gas") {
          console.log("Invalid fuel!");
      }
  
      if (litres >= 25) {
          switch (fuelType) {
              case "Diesel":
                  console.log(`You have enough diesel.`);
                  break;
              case "Gasoline":
                  console.log(`You have enough gasoline.`);
                  break;
              case "Gas":
                  console.log(`You have enough gas.`);
                  break;
          }
  
      } else if (litres < 25) {
          switch (fuelType) {
              case "Diesel":
                  console.log(`Fill your tank with diesel!`);
                  break;
              case "Gasoline":
                  console.log(`Fill your tank with gasoline!`);
                  break;
              case "Gas":
                  console.log(`Fill your tank with gas!`);
                  break;
          }
      }
  }