Made the List generic, though more care needs to be taken when using it since memory leaks can happen when structs are used with it.

src/list.c

@@ -1,5 +1,4 @@
 #include "../includes/list.h"
-#include <stdio.h>
 
 List* CreateList() {
     List *new = malloc(sizeof(List));
@@ -9,7 +8,7 @@ List* CreateList() {
         return NULL;
     }
 
-    new->root = malloc(sizeof(char*) * LISTDEFAULTSIZE);
+    new->root = malloc(sizeof(void*) * LISTDEFAULTSIZE);
 
     if (!new->root) {
         fprintf(stderr, "Failed to malloc() memory for List contents.\n");
@@ -23,14 +22,16 @@ List* CreateList() {
     return new;
 }
 
-int AddListItem(const char *value, List* list) {
+int AddListItem(const void *value, size_t size, List* list) {
     if (!list) return -1;
+    if (!value) return -1;
+    if (size == 0) return - 1;
 
     if (list->capacity < list->size + 1) {
-        void* ptr = realloc(list->root, sizeof(char*) * list->capacity * 2);
+        void* ptr = realloc(list->root, sizeof(void*) * list->capacity * 2);
         //Note: realloc will free list->root if it succeeds.
         if (!ptr) {
-            fprintf(stderr, "Failed to resize array with realloc() for new item '%s'.\n", value);
+            fprintf(stderr, "Failed to resize array with realloc() (%d bytes).\n", list->capacity * 2);
             return -1;
         }
 
@@ -38,16 +39,14 @@ int AddListItem(const char *value, List* list) {
         list->capacity = list->capacity * 2;
     }
 
-    unsigned long valueLength = strlen(value) + 1;  //Plus one for the null byte.
-
-    char* item = malloc(valueLength);
+    void* item = malloc(size);
 
     if (!item) {
-        fprintf(stderr, "Failed to malloc() new memory for '%s' (length: %lu bytes).\n", value, valueLength);
+        fprintf(stderr, "Failed to malloc() new memory (%lu bytes).\n", size);
         return -1;
     }
 
-    strncpy(item, value, valueLength);
+    memcpy(item, value, size);
 
     list->root[list->size] = item;
     list->size++;
@@ -55,18 +54,6 @@ int AddListItem(const char *value, List* list) {
     return 0;
 }
 
-void PrintList(const List* list) {
-    if (!list) return;
-
-    const List *current = list;
-
-    printf("Size: %d; Capacity: %d\n", list->size, list->capacity);
-
-    for(int i = 0; i < list->size; i++) {
-        printf("%d: %s\n", i, list->root[i]);
-    }
-}
-
 void DestroyList(List* list) {
     if (!list) return;