YOU SAID:
Hi you what are you doing here
INTO JAPANESE
こんにちはあなたはここで何をしているの
BACK INTO ENGLISH
Hello What are you doing here
INTO JAPANESE
やぁ ここで何してる?
BACK INTO ENGLISH
Hello. What are you doing here?
INTO JAPANESE
やぁ ここで何してる?
BACK INTO ENGLISH
Hello. What are you doing here?
That didn't even make that much sense in English.