2788. Split Strings by Separator 

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class Solution {
    public List<String> splitWordsBySeparator(List<String> words, char separator) {
        List<String> resultList = new ArrayList<>();

        for (String word : words) {
            int i = 0; // [i, j)
            for (int j = 0; j < word.length(); j++) {
                // 分隔符与字符串末尾字符分开处理是因为右边界不一样
                if (word.charAt(j) == separator) {
                    if (i < j) { // 防止收集到空字符串
                        resultList.add(word.substring(i, j));
                    }
                    i = j + 1;
                } else if (j == word.length() - 1) { // 字符串末尾且不是 separator
                    resultList.add(word.substring(i, word.length())); // 注意此处的右边界是 word.length
                }
            }
        }

        return resultList;
    }
}

References

2788. Split Strings by Separator