2710. Remove Trailing Zeros From a String 

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class Solution {
    public String removeTrailingZeros(String num) {
        int endIndex = num.length() - 1;
        while (endIndex >= 0 && num.charAt(endIndex) == '0') {
            endIndex--;
        }
        return num.substring(0, endIndex + 1);
    }
}

Reference

2710. Remove Trailing Zeros From a String