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func rotate(matrix [][]int)  {
    n := len(matrix)
    for i := 0; i < n; i++ {
        for j := 0; j < n-i-1; j++ {
            matrix[i][j], matrix[n-j-1][n-i-1] = matrix[n-j-1][n-i-1], matrix[i][j]
        }
    }

    for i := 0; i < n; i++ {
        slices.Reverse(matrix[i])
    }
}