#include <string>
#include <vector>

std::vector<std::string> towerBuilder(unsigned nFloors) {
  std::vector<std::string> piramid;

  for (unsigned int i = 0; i < nFloors; i++){
    std::string str = "";
    int nStars = i * 2 + 1;
    int nSpaces = nFloors-1-i;
    str.append(nSpaces, ' ');
    str.append(nStars, '*');
    str.append(nSpaces, ' ');
    piramid[i] = str;
  };
  return piramid;

}