can anybody tell me what im doing wrong here?

Question

https://code.sololearn.com/cSVjh3R99Jgo/?ref=app

Answer 1

first of all thanks for your advice, i modified the code and it worked correct.
second of all i dont quite understand some stuff here.
1. why do we get a copy of obj ninja in line 35
2.why do we have to pass a reference of the value of ninja to make it work.
3.is this problem because of protected access specifier?

Answer 2

also whats the difference between:
*e1
and
&e