#include "function_basics.hpp" namespace functions { auto square(int value) -> int { (void)value; return 0; } void swap_integers(int& lhs, int& rhs) { (void)lhs; (void)rhs; } auto concatenate(const std::vector& parts) -> std::string { (void)parts; return {}; } void append_suffix(std::string& text, const std::string& suffix) { (void)text; (void)suffix; } } // namespace functions