Divide a String Into Groups of Size k LeetCode solution in C++

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class Solution {
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 public:
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  vector<string> divideString(string s, int k, char fill) {
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    vector<string> v;
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    for (int i = 0; i < s.size(); i = i + k) {
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      string t = s.substr(i, k); // make substring of size atmost k
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      if (t.size() == k) // if size if k then push
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      {
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        v.push_back(t);
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        continue;
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      }
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      int l = t.size();                 // if it is the last group and size if less than k
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      for (int j = 0; j < (k - l); j++) // add fill char to t to make size k
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        t += fill;
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      v.push_back(t);
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    }
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    return v;
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  }
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};