Adding macros and function to detect -tok input

runner.h

@@ -0,0 +1,8 @@
+#define ALPHA_OFFSET 5
+#define TOK_LEN 3
+#define INVALID_ARG "invalid"
+#define DIFF_ARG "diff"
+#include <string.h>
+
+int main(int argc, char* argv);
+char *is_tok(int argc, char* argv);