Make The String Great LeetCode solution in JavaScript

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var makeGood = function (s) {
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  const sArr = [];
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  for (let i = 0; i < s.length; i++) {
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    sArr.push(s[i]);
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  }
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  const popper = function () {
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    let counter = 0;
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    for (let i = 0; i < sArr.length; i++) {
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      if (sArr[i] !== sArr[i + 1]) {
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        if (
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          sArr[i].toUpperCase() === sArr[i + 1] ||
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          sArr[i].toLowerCase() === sArr[i + 1]
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        ) {
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          sArr.splice(i, 2);
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          counter++;
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        }
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      }
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    }
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    if (counter > 0) {
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      popper();
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    }
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  };
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  popper();
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  return sArr.join("");
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};