Results 4 issues of fvdcx

@tancredi Could we use icon-font-generator as API/library instead of CLI tool

`for (int i = 0; i < n; ++i) max_profit = max(max_profit, f[i] + g[i]);` I think `i` would better range from `0` to `n-1` `[0, n-1)` Because the case...

If I input `xx/yy/zz/*.txt`, It doesn't work. Only if `xx/yy/zz/abc.txt` can work? Could we support regex?