Arrumar formatação de strings em Placa de Carro #765

from brutils import get_format_license_plate
>>> print(get_format_license_plate("ABC123"))
"None"
>>> print(get_format_license_plate("abc123"))
"None"

from brutils import convert_license_plate_to_mercosul
>>> print(convert_license_plate_to_mercosul("ABC123"))
"None"
>>> print(convert_license_plate_to_mercosul("abc123"))
"None"

from brutils import remove_symbols_license_plate
>>> remove_symbols_license_plate("ABC-123")
"ABC123"
>>> remove_symbols_license_plate("abc123")
"abc123"

from brutils import get_format_license_plate
>>> print(get_format_license_plate("ABC1234"))
"LLLNNNN" 
>>> print(get_format_license_plate("abc1234"))
"LLLNNNN"

from brutils import convert_license_plate_to_mercosul
>>> print(convert_license_plate_to_mercosul("ABC1234"))
"ABC1C34"
>>> print(convert_license_plate_to_mercosul("abc1234"))
"ABC1C34"

from brutils import remove_symbols_license_plate
>>> remove_symbols_license_plate("ABC-1234")
"ABC1234"
>>> remove_symbols_license_plate("abc1234")
"abc1234"