import base64
 
def goomoji_decode(code):
    #Base64 decode.
    binary = base64.b64decode(code)
    #UTF-8 decode.
    decoded = binary.decode('utf8')
    #Get the UTF-8 value.
    value = ord(decoded)
    #Hex encode, trim the 'FE' prefix, and uppercase.
    return format(value, 'x')[2:].upper()
 
def goomoji_encode(code):
    #Add the 'FE' prefix and decode.
    value = int('FE' + code, 16)
    #Convert to UTF-8 character.
    encoded = chr(value)
    #Encode UTF-8 to binary.
    binary = bytearray(encoded, 'utf8')
    #Base64 encode return end return a UTF-8 string. 
    return base64.b64encode(binary).decode('utf-8')
 
 
print(goomoji_decode('876Urg=='))
print(goomoji_encode('B0D'))

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

QjBE

B0D