YOU SAID:
the purple cat is walking by itself at midnight
INTO JAPANESE
紫色の猫は真夜中に一人で歩いています
BACK INTO ENGLISH
Purple cat is walking alone at midnight
INTO JAPANESE
紫猫は真夜中に一人で歩いています
BACK INTO ENGLISH
Purple cat is walking alone at midnight
That didn't even make that much sense in English.