Add unit tests

lib/btclock/utils.cpp

@@ -0,0 +1,48 @@
+#include "utils.hpp"
+
+int modulo(int x, int N)
+{
+    return (x % N + N) % N;
+}
+
+double getSupplyAtBlock(uint blockNr) {
+    if (blockNr >= 33 * 210000) {
+        return 20999999.9769;
+    } 
+
+    const int initialBlockReward = 50;  // Initial block reward
+    const int halvingInterval = 210000;  // Number of blocks before halving
+
+    int halvingCount = blockNr / halvingInterval;
+    double totalBitcoinInCirculation = 0;
+
+    for (int i = 0; i < halvingCount; ++i) {
+        totalBitcoinInCirculation += halvingInterval * initialBlockReward * std::pow(0.5, i);
+    }
+
+    totalBitcoinInCirculation += (blockNr % halvingInterval) * initialBlockReward * std::pow(0.5, halvingCount);
+
+    return totalBitcoinInCirculation;
+}
+
+std::string formatNumberWithSuffix(int64_t num) {
+    const long long quadrillion = 1000000000000000LL;
+    const long long trillion = 1000000000000LL;
+    const long long billion = 1000000000;
+    const long long million = 1000000;
+    const long long thousand = 1000;
+
+    if (num >= quadrillion) {
+        return std::to_string(num / quadrillion) + "Q";
+    } else if (num >= trillion) {
+        return std::to_string(num / trillion) + "T";
+    } else if (num >= billion) {
+        return std::to_string(num / billion) + "B";
+    } else if (num >= million) {
+        return std::to_string(num / million) + "M";
+    } else if (num >= thousand) {
+        return std::to_string(num / thousand) + "K";
+    } else {
+        return std::to_string(num);
+    }
+}