diff --git a/day4/p1.c b/day4/p1.c
index d370be7..ba08bd9 100644
--- a/day4/p1.c
+++ b/day4/p1.c
@@ -3,7 +3,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
-#include <stdbool.h>
 
 
 uint64_t parse_number(char *end);
@@ -43,12 +42,14 @@ int main(int argc, char **argv) {
 
         for (char *n_pos = pipe_pos + 4;; n_pos += 3) {
             uint8_t n = parse_number(n_pos-1);
+
             for (size_t i = 0; i < winning_numbers_len; ++i) {
                 if (n != winning_numbers[i])
                     continue;
                 points = (points == 0) ? 1 : points * 2;
                 break;
             }
+
             if (*n_pos == '\n')
                 break;
         }
diff --git a/day4/p2.c b/day4/p2.c
index 5a60fec..62764bb 100644
--- a/day4/p2.c
+++ b/day4/p2.c
@@ -3,7 +3,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
-#include <stdbool.h>
 
 
 #define STACK_SZ UINT8_MAX+1
@@ -42,24 +41,25 @@ int main(int argc, char **argv) {
             winning_numbers = (uint8_t *) calloc(winning_numbers_len, sizeof(uint8_t));
         }
 
-        for (size_t i = 0, wl_pos = (size_t)colon_pos+4; i < winning_numbers_len; ++i, wl_pos += 3) {
+        for (size_t i = 0, wl_pos = (size_t)colon_pos+4; i < winning_numbers_len; ++i, wl_pos += 3)
             winning_numbers[i] = parse_number((char *)(wl_pos-1));
-        }
 
         uint64_t card_copies = 1 + stack[stack_pos++];
 
         total_copies += card_copies;
 
-        size_t old_sp = stack_pos;
+        stackpointer_t old_sp = stack_pos;
 
         for (char *n_pos = pipe_pos + 4;; n_pos += 3) {
             uint8_t n = parse_number(n_pos-1);
+
             for (size_t i = 0; i < winning_numbers_len; ++i) {
                 if (n != winning_numbers[i])
                     continue;
                 stack[stack_pos++] += card_copies;
                 break;
             }
+
             if (*n_pos == '\n')
                 break;
         }