const gemstones = (stoneArray) => {
    try {
        let gemStoneCount = 0;
        let referenceString = "";
        let tempCount = 1;
        if(stoneArray instanceof Array && stoneArray.length > 0) {
            // REMOVING DUPLICATES FROM THE STRING
            referenceString = [...new Set(stoneArray[0].split(""))].join("");
            for(let i=0;i<referenceString.length;i++) {
                tempCount = 1;
                for(let j=1;j<stoneArray.length;j++) {
                    if(stoneArray[j].indexOf(referenceString[i]) > -1) {
                        tempCount++;
                    }
                }
                if(tempCount === stoneArray.length) {
                    gemStoneCount++;
                }
            }
        }
        return gemStoneCount;
    } catch (error) {
        console.log(error.message);
    }
}