public IEnumerable <user_sign_in_Result> GetUser([FromBody] user_sign_in_Result user)
{
var ob = db.user_sign_in(user.uid);
int count = ob.Count <user_sign_in_Result>();
if (count == 0)
{
string username = UsernameCreater(user.fullname, user.uid);
db.user_sign_up(user.uid, username, user.photourl, user.fullname, System.DateTime.Now);
}
return(db.user_sign_in(user.uid));
}