How to delete duplicates of an item from a slice?

I'm writing a command line tool that will delete peers from a text file.

This is the text file. Its reference in code is cfg.Bootstrap

 "Bootstrap": [
{
  "Address": "/ip4/162.243.139.64/tcp/5001",
  "PeerID": "QmXZPT1SLcczjNSLnSCsQBWwbosKjrDRo122Ys8ajKoQXQ"
},
{
  "Address": "/ip4/162.243.139.64/tcp/5001",
  "PeerID": "QmXZPT1SLcczjNSLnSCsQBWwbosKjrDRo122Ys8ajKoQXA"
},
{
  "Address": "/ip4/162.243.139.64/tcp/5001",
  "PeerID": "QmXZPT1SLcczjNSLnSCsQBWwbosKjrDRo122Ys8ajKoQXQ"
},
{
  "Address": "/ip4/162.243.139.64/tcp/5001",
  "PeerID": "QmXZPT1SLcczjNSLnSCsQBWwbosKjrDRo122Ys8ajKoQXA"
}

]

The peer object is created using a user supplied PeerID and Address. It looks like this

peer := config.BootstrapPeer{
				Address: address,
				PeerID:  pID,
			}

The goal is to remove all peers cfg.Bootstrap that contain the user supplied Address and PeerID

   //iterate through the list of peers multiple times so that we delete all matches
   for i := range cfg.Bootstrap {
    		
            //iterate through the list of peers
    		for i, val := range cfg.Bootstrap {
    
                //if the user supplied PeerID and Address match a Peer object in cfg.Bootstrap..
    			if(val.PeerID == peer.PeerID && val.Address == peer.Address) {
    				
                //remove that element 
    				cfg.Bootstrap = append(cfg.Bootstrap[:i], cfg.Bootstrap[i+1:]...)
    			}
    		
    		}
    		
    			fmt.Println(i)

	}

This works UNLESS the last peer in cfg.Bootstrap has a duplicate. If it has a duplicate then Go panics with

panic: runtime error: slice bounds out of range

I need to make it so the user can delete all copies of a peer that include the last peer. Any ideas?

The basic idea is to copy values != to peer to the beginning of the slice and trim the excess when done.

i := 0
for _, v := range cfg.Bootstrap {
   if v.PeerId == peer.PeerId && v.Address == peer.Address {
      continue
   }
   cfg.Bootstrap[i] = v
   i++
}
cfg.Bootstrap = cfg.Bootstrap[:i]

Another approach (if you have the option) is to first sort, then remove duplicates. Eg with strings;

strs = []string{"a", "b", "c", "d", "e", "b", "a", "e", "e", "d"}
sort.Strings(strs)

var last string
first_item := true
dedupped := []string{}
for _, s := range strs {
	if first_item {
		dedupped = append(dedupped, s)
		first_item = false
	} else {
		if s != last {
			dedupped = append(dedupped, s)
		}
	}
	last = s
}

Marshal your struct into json and then stringify

data, _ := json.Marshal(yourStruct)
dup := make(map[string]bool)
dup[string(data)] = true

Now use this dup to filter out duplicates