A couple of days ago I updated to MacOS High Sierra, something went wrong and the laptop is stuck with brick, without hesitation, decided to reinstall OC.
Broke that into two sections (so as not to lose old data) and installed the second OS.
Moved the old to the new OS and deleted the first partition with the command
sudo diskutil eraseVolume "Free Space" %noformat% /dev/disk0s3
and tried to expand the size of the second partition with the command
diskutil apfs resizeContainer disk0s2 0
but all to no avail...
Guru terminal, asking for your help :)