#include "offer_05.hpp"

string Solution::replaceSpace(string s) {
  int len = s.length();
  int cnt{0};
  for (int i{0}; i < len; ++i) {
    if (s[i] == ' ') {
      s.push_back(' ');
      s.push_back(' ');
      cnt++;
    }
  }
  len = s.length();
  for (int fast = len - 1, slow = len - 1 - 2 * cnt; fast >= 0; --slow) {
    if (s[slow] == ' ') {
      s[fast--] = '0';
      s[fast--] = '2';
      s[fast--] = '%';
    } else {
      s[fast--] = s[slow];
    }
  }
  return s;
}