The following macro will help you remove the duplicates and give you a clean string.
Function stringOfUniques(inputString As String) As String
Dim inArray() As String
Dim xVal As Variant
Dim s As String
inArray = Split(inputString, “,”)
For Each xVal In inArray
If InStr(s, Trim(xVal)) = 0 Then _
s = s & Trim(xVal) & “,”
stringOfUniques = s
Step 1: To insert a macro, If you are using a Mac, click fn+alt+F11, This is how you can open a macro screen,
Step 2: Paste the above macro into the macro screen and save it.
Step 3: Now choose the column in which you want to apply the formula and type in =stringOfuniques, Automatically the function we defined will pop up.
Step 4: After typing the function name, click on the input column you wanted to remove the duplicates on.
Step 5: Now you can see the desired output.