Reorganize tests

examples/c/fib5.c

@@ -0,0 +1,22 @@
+int fibonacci(int n) {
+    int i = 0;
+    int t1 = 0, t2 = 1, next_term = 0;
+
+    if (n < 2) {
+        return n;
+    }
+
+    i = 1;
+    do {
+        next_term = t1 + t2;
+        t1 = t2;
+        t2 = next_term;
+        ++i;
+    } while (i < n);
+
+    return t2;
+}
+
+int main() {
+    return fibonacci(9) == 34;
+}