I used to have a bootcamp partition but somehow while attempting to remove it its changed into a container disk. (don't know how this happened, I didn't explicitly create a container).

[![enter image description here][1]][1]


[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/jMWnh.png
  [2]: https://i.sstatic.net/qbFno.png


diskutil list:

    /dev/disk0 (internal):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                         500.3 GB   disk0
       1:                        EFI EFI                     314.6 MB   disk0s1
       2:                 Apple_APFS Container disk1         402.0 GB   disk0s2
       3:                 Apple_APFS Container disk2         97.8 GB    disk0s3
       4:                 Apple_Boot Boot OS X               134.2 MB   disk0s4
    
    /dev/disk1 (synthesized):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      APFS Container Scheme -                      +402.0 GB   disk1
                                     Physical Store disk0s2
       1:                APFS Volume Macintosh HD            336.1 GB   disk1s1
       2:                APFS Volume Preboot                 23.2 MB    disk1s2
       3:                APFS Volume Recovery                515.0 MB   disk1s3
       4:                APFS Volume VM                      2.1 GB     disk1s4
    
    /dev/disk2 (synthesized):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      APFS Container Scheme -                      +97.8 GB    disk2
                                     Physical Store disk0s3


How can I delete this and merge its space back into the main drive?