def color_translator(color):

 def color_translator(color):

    if color == "red":

        hex_color = "#ff0000"

    elif color == "green":

        hex_color = "#00ff00"

    elif color == "blue":

        hex_color = "#0000ff"

    else:

        hex_color = "unknown"

    return hex_color

print(color_translator("blue")) # Should be #0000ff

print(color_translator("yellow")) # Should be unknown

print(color_translator("red")) # Should be #ff0000

print(color_translator("black")) # Should be unknown

print(color_translator("green")) # Should be #00ff00

print(color_translator("")) # Should be unknown