improved random seed to be less predictable

src/main.c

@@ -1,18 +1,12 @@
-#include <stdio.h>
 #include <time.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
 
 int main(void) {
-    srand(time(NULL)); // set the random seed to the system time
-    char* result = NULL;
-
-    if (rand() & (~1) != 0) {
-        result = "heads";
-    }
-    else {
-        result = "tails";
-    }
-
-    printf("%s\n", result);
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    srand((uint32_t)(ts.tv_nsec ^ ts.tv_sec));  // combine seconds and nanoseconds
+    printf("%s\n", (rand() & 1) ? "heads" : "tails");
     return 0;
 }