simple solution (easy to understand)
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\n# @param {String} s\n# @param {Integer} k\n# @param {Character} fill\n# @return {String[]}\ndef divide_string(s, k, fill)\n    result = []\n    s.chars.each_slice(k){ |char| result << char.join}\n    result[-1] += fill * ( k - result[-1].length ) if result[-1].length != k\n    result\nend\n```
['Ruby']