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Compile Error

guanine.cpp: In function ‘int main()’:
guanine.cpp:13:25: error: no match for ‘operator=’ (operand types are ‘std::vector<std::__cxx11::basic_string<char> >’ and ‘void’)
13 | str = str.push_back(s);
| ^
In file included from /usr/include/c++/9/vector:72,
from /usr/include/c++/9/functional:62,
from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
from /usr/include/c++/9/algorithm:71,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:65,
from guanine.cpp:1:
/usr/include/c++/9/bits/vector.tcc:198:5: note: candidate: ‘std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp = std::__cxx11::basic_string<char>; _Alloc = std::allocator<std::__cxx11::basic_string<char> >]’
198 | vector<_Tp, _Alloc>::
| ^~~~~~~~~~~~~~~