valgrind shows definitely lost blocks in simple code

kayseri (5)
How can i remove memory leaks in simple code below?
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int main() {
    char* str = new char();
    str = "test";
    //delete str;
    return 0;
}

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g++ main.cpp
valgrind --leak-check=yes  ./a.out

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...
==14600== LEAK SUMMARY:
==14600==    definitely lost: 1 bytes in 1 blocks
...

Thanks,
Cubbi (4774)
The leak occurs at line 3, where the only copy of the pointer to the dynamically-allocated char is destroyed by assignment. Fixing this depends on what you want the program to do. Currently it has no observable behavior at all.
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