Challenge 1: A min_value Function Template — Possible Solution
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#include <iostream>

template<typename T>
T min_value(T a, T b) {
    return (a < b) ? a : b;
}

int main() {
    std::cout << min_value(10, 4) << std::endl;
    std::cout << min_value(3.7, 1.2) << std::endl;
    return 0;
}

Output:

    4
    1.2

WHY THIS WORKS AS AN ANSWER
------------------------------
The single template definition works for both calls: min_value(10, 4)
deduces T as int, min_value(3.7, 1.2) deduces T as double -- per the
chapter, these are two genuinely separate compiled functions under the
hood (monomorphization), each fully type-checked as if hand-written for
that specific type, even though only one template was written in
source.