code: def rgb_to_ansi(color):
          
  
          if color[0] != '#' or len(color) != 7:
              return None
  
          try:
              r = round(int(color[1:3], 16) / 51.0)  # Normalize between 0-5
              g = round(int(color[3:5], 16) / 51.0)
              b = round(int(color[5:7], 16) / 51.0)
              n = int(36 * r + 6 * g + b + 16)
              return 'ansi_{0:d}'.format(n)
          except ValueError:
              return None
docs: Converts hex RGB to the 6x6x6 xterm color space
  
          Args:
              color (str): RGB color string in the format "#RRGGBB"
  
          Returns:
              str: ansi color string in the format "ansi_n", where n
                  is between 16 and 230
  
          Reference:
              https://github.com/chadj2/bash-ui/blob/master/COLORS.md