static File replaceFileExtension(File f, S extOld, S extNew) {
  ret replaceExtension(f, extOld, extNew);
}



static File replaceFileExtension(File f, S extNew) {
  ret replaceExtension(f, extNew);
}

static File replaceFileExtension(S extOld, S extNew, File f) {
  ret replaceFileExtension(f, extOld, extNew);
}