Space lost after bootcamp fail

Hello

This is my first apple computer (macbook air 2015). I had to install windows on this because my school wanted it.

I tried installing through bootcamp and it failed the message was "windows support software could not be installed on targeted device" then it said it was removing the partition and for hours nothing happened.

Then again opening bootcamp assistant the message was "The startup disk cannot be partitioned or restored to a single partition"

I searched the community and found some answers but my case was kind of different

My original storage was 128GB now its 84GB.

mac os mojave version 10.14.2

terminal command: diskutil list

terminal output:

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *121.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                 Apple_APFS Container disk1         84.0 GB    disk0s2

/dev/disk1 (synthesized):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      APFS Container Scheme -                      +84.0 GB    disk1

                                 Physical Store disk0s2

   1:                APFS Volume Macintosh HD            43.5 GB    disk1s1

   2:                APFS Volume Preboot                 44.8 MB    disk1s2

   3:                APFS Volume Recovery                517.0 MB   disk1s3

   4:                APFS Volume VM                      1.1 GB     disk1s4

terminal command: diskutil cs list

terminal output: No CoreStorage logical volume groups found

Also when i open disk utility

Can anyone help me. I tried searching the community but could not find situation similar to mine.