Reorganize code and remove hack for empty block outputs

inc/util.h

@@ -0,0 +1,9 @@
+#pragma once
+#include <unistd.h>
+
+#define LEN(arr) (sizeof(arr) / sizeof(arr[0]))
+#define MAX(a, b) (a > b ? a : b)
+
+int gcd(int, int);
+void closePipe(int[2]);
+void trimUTF8(char*, unsigned int);