code: def rgb_to_hex(rgba):
      
      rgba = rgba.split('/')
      hex_value = '#' + rgba[0][:2] + rgba[1][:2] + rgba[2][:2]
      return hex_value
docs: expects: rgba value, ex: 0000/0000/0000/dddd
      returns: hex value, ex: #000000
      ignores alpha value