Formula to extract unique string from sheet2 column C

I have sheet2 with column C with data.

i want to extract unique values from Sheet2 col C into sheet1  A1 single cell separated by comma

Flora EdwardsMedicineAsked:
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pls try (easier with vba) not sure it's possible with formula
Sub macro()
Set ws2 = Sheets("Sheet2")
lr = ws2.Cells(Rows.Count, 3).End(xlUp).Row

Set Rng = ws2.Range(Range("C2"), ws2.Range("C" & Rows.Count).End(xlUp))
Set dict = CreateObject("Scripting.Dictionary")

For Each c In Rng
    dict(c.Value) = ""
arrKeys = dict.Keys
res = Join(arrKeys, ",")
Sheets("Sheet1").Range("A1") = res
End Sub

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Flora EdwardsMedicineAuthor Commented:
thank you again
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Microsoft Excel

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