refactor various files

S1/GdCP/uebung/a02-testing.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int sequence(int x, int n);
+
+int main(int argc, char *argv[]) {
+  
+  int x = 3;
+  int min = -2, max = 8;
+
+  for (int n = min; n <= max; n++)
+    printf("sequence(%d, %d) == %d\n", x, n, sequence(x,n));
+
+  return 0;
+}