fix: Add return 0 in bactracking/magic_sequence.cpp (#1589)

* Update magic_sequence.cpp

* clang-format and clang-tidy fixes for ff127de6

* Update backtracking/magic_sequence.cpp

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Abhinn Mishra <49574460+mishraabhinn@users.noreply.github.com>
Co-authored-by: David Leal <halfpacho@gmail.com>

backtracking/magic_sequence.cpp

@@ -132,4 +132,5 @@ int main() {
             backtracking::magic_sequence::print(item);
         }
     }
+    return 0;
 }