diff --git a/c/2022/3/problem.c b/c/2022/3/problem.c
index 5812313..164041d 100644
--- a/c/2022/3/problem.c
+++ b/c/2022/3/problem.c
@@ -63,6 +63,20 @@ int priority(char *line) {
   return 0;
 }
 
+int three_line_priority(char *one, char *two, char *three) {
+  Compartment c1 = fill_compartment(one);
+  Compartment c2 = fill_compartment(two);
+  Compartment c3 = fill_compartment(three);
+
+  for (int i = 0; i < 52; i++) {
+    if (c1.contents[i] && c2.contents[i] && c3.contents[i]) {
+      return i + 1;
+    }
+  }
+
+  return 0;
+}
+
 int main() {
   char *line;
 
@@ -71,7 +85,20 @@ int main() {
     sum += priority(line);
   }
 
+  aoc_reset_read_line();
+
+  int three_line_sum = 0;
+  char *line_1, *line_2, *line_3;
+  while (
+	 (line_1 = aoc_read_line()) != NULL &&
+	 (line_2 = aoc_read_line()) != NULL &&
+	 (line_3 = aoc_read_line()) != NULL
+	 ) {
+    three_line_sum += three_line_priority(line_1, line_2, line_3);
+  }
+  
   printf("Part 1: %d\n", sum);
+  printf("Part 2: %d\n", three_line_sum);
 
   aoc_free();
   return 0;
diff --git a/c/lib/aoc.h b/c/lib/aoc.h
index f8fe1e9..f5f3118 100644
--- a/c/lib/aoc.h
+++ b/c/lib/aoc.h
@@ -23,12 +23,17 @@ char *aoc_read_input(void) {
   return input_buffer;
 }
 
+char *read_line_buffer = NULL;
 char *seek = NULL;
 
 char *aoc_read_line(void) {
   if (input_buffer == NULL) aoc_read_input();
+  if (read_line_buffer == NULL) {
+    read_line_buffer = malloc(strlen(input_buffer) + 1);
+    strcpy(read_line_buffer, input_buffer);
+  }
 
-  if (seek == NULL) seek = input_buffer;
+  if (seek == NULL) seek = read_line_buffer;
 
   char *line_break = strstr(seek, "\n");
   if (line_break == NULL) return NULL;
@@ -39,6 +44,12 @@ char *aoc_read_line(void) {
   return token;
 }
 
+void aoc_reset_read_line(void) {
+  strcpy(read_line_buffer, input_buffer);
+  seek = NULL;
+}
+
 void aoc_free(void) {
   free(input_buffer);
+  free(read_line_buffer);
 }