修改目录结构，优化CMakeLists

src/202.c

@@ -0,0 +1,32 @@
+#include <stdbool.h>
+
+int bitSquareSum(int n)
+{
+    int sum = 0;
+    while (n > 0)
+    {
+        int bit = n % 10;
+        sum += bit * bit;
+        n /= 10;
+    }
+
+    return sum;
+}
+
+bool isHappy(int n)
+{
+    int slow = n, fast = n;
+    do
+    {
+        slow = bitSquareSum(slow);
+        fast = bitSquareSum(fast);
+        fast = bitSquareSum(fast);
+    } while (slow != fast);
+
+    return slow == 1;
+}
+
+int main()
+{
+    return 0;
+}