Initial data commit

Task/Factorial/C3/factorial-1.c3

@@ -0,0 +1,9 @@
+fn int factorial(int n)
+{
+    int result = 1;
+    for (int i = 1; i <= n; ++i)
+    {
+        result *= i;
+    }
+    return result;
+}

Task/Factorial/C3/factorial-2.c3

@@ -0,0 +1,4 @@
+ fn int factorial(int n)
+{
+    return n == 0 ? 1 : n * factorial(n - 1);
+}

Task/Factorial/C3/factorial-3.c3

@@ -0,0 +1,13 @@
+macro int factorial($n)
+{
+    $if ($n == 0):
+        return 1;
+    $else:
+        return $n * @factorial($n - 1);
+    $endif;
+}
+
+fn void test()
+{
+    int x = @factorial(10);
+}