search the BNBUSDT chart for any maximum and minimum to determine the maximum and minimum of a Japanese candle that is in the extreme, and plot Fibonacci levels from 0 to 1 on the extreme candle, where 0 should be at the extreme.

def fibonacci_levels(df):
    # Find the maximum and minimum of candles that have an extreme position
    maximum = df.iloc[df.High.idxmax()].High
    minimum = df.iloc[df.Low.idxmin()].Low
    
    # Use the function to find the Fibonacci levels
    fibonacci = fib_retracements(df['High'], df['Low'])
    
    # Draw the Fibonacci levels on the chart
    plt.figure(figsize=(10,5))
    plt.plot(df.index, df.High, label = 'High')
    plt.plot(df.index, df.Low, label = 'Low')
    plt.plot(df.index, df.Close, label = 'Close')
    plt.plot(df.index, df.Open, label = 'Open')
    plt.axhline(y=maximum, color='blue', linestyle='-')
    plt.axhline(y=minimum, color='red', linestyle='