'how can I change UnsafeMutableBufferPointer to withUnsafeMutablePointer?

I got a warning for the following function after a recent update, I am not sure how to convert it with withUnsafeMutablePointer as indicated by Xcode, not very familiar with swift.

        var number: UInt16 = 0
        let realStartIndex = index+self.startIndex
        self.copyBytes(to: UnsafeMutableBufferPointer(start: &number, count: 2), from:
                        realStartIndex..<(realStartIndex+MemoryLayout<UInt16>.size))
        return number
    }```

swift

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'how can I change UnsafeMutableBufferPointer to withUnsafeMutablePointer?

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