Merge partitions back to a single partition help

[lekekoko]

This is my diskutil list. Please how can I merge back the partition

Last login: Tue Mar 5 17:29:44 on ttys000


Lekes-MacBook-Pro:~ koko$ diskutil eraseVolume BC2 jhfs+ disk0s4


BC2 does not appear to be a valid file system format


Use diskutil listFilesystems to view a list of supported file systems


Lekes-MacBook-Pro:~ koko$ diskutil list


/dev/disk0 (internal):


#: TYPE NAME SIZE IDENTIFIER


0: GUID_partition_scheme 121.3 GB disk0


1: EFI EFI 314.6 MB disk0s1


2: Apple_APFS Container disk1 37.7 GB disk0s2


3: Apple_HFS Untitled 83.1 GB disk0s3


4: Apple_Boot Boot OS X 134.2 MB disk0s4




/dev/disk1 (synthesized):


#: TYPE NAME SIZE IDENTIFIER


0: APFS Container Scheme - +37.7 GB disk1


Physical Store disk0s2


1: APFS Volume Macintosh HD 20.1 GB disk1s1


2: APFS Volume Preboot 66.9 MB disk1s2


3: APFS Volume Recovery 1.6 GB disk1s3


4: APFS Volume VM 2.1 GB disk1s4