Защо judge ми дава 80/100 ?

https://judge.softuni.org/Contests/Practice/Index/1773#1

function treasure(arr) {

  let chest = arr.shift().split("|");

  let command = arr.shift();

  let steal = [];

  let counter = 0;

  while (command != "Yohoho!") {

    let tokens = command.split(" ");

    let action = tokens.shift();

    if (action == "Loot") {

      let treasureToLoot = tokens.slice(0);

      for (let treasure of treasureToLoot) {

        if (!chest.includes(treasure)) {

          chest.unshift(treasure);

        }

      }

    } else if (action == "Drop") {

      let idx = Number(tokens[0]);

      if (idx >= 0 && idx < chest.length) {

        let theLoot = chest.splice(idx, 1);

        chest.push(theLoot);

      }

    } else if (action == "Steal") {

      let count = Number(tokens[0]);

      if (count > chest.length + 1) {

        steal = chest;

        console.log(steal);

      } else {

        steal = chest.splice(-count,);

      }

    }

    console.log(steal.join(", "));

    command = arr.shift();

  }

  if (chest.length == 0) {

    console.log("Failed treasure hunt.");

  } else {

    for (let el of chest) {

      for (let i = 0; i < el.length; i++) {

        counter++;

      }

    }

    console.log(`Average treasure gain: ${(counter / chest.length).toFixed(2)} pirate credits.`)

  }

}

treasure([

  "Gold|Silver|Bronze|Medallion|Cup",

  "Loot Wood Gold Coins",

  "Loot Silver Pistol",

  "Drop 3",

  "Steal 3",

  "Yohoho!",

])