new StringBuilder functions

src/collections/List.c

@@ -7,12 +7,19 @@ List_ List_alloc_size(u32 initial_size){
     return List_construct_size(malloc(allocated_size), 0, allocated_size);
 }
 
-void* List_expand_size(List_* ptr, u32 expansion_size){
+List_ List_copy(const List_ src){
+    List_ copy = List_alloc_size(src.allocated_size);
+    if(copy.data != NULL)
+        memcpy(copy.data, src.data, src.size);
+    return copy;
+}
+
+void* List_expand_size(List_* ptr, u32 size_to_add){
     u32 occupied_size = ptr->size;
     u32 expanded_alloc_size = ptr->allocated_size;
     if(expanded_alloc_size == 0)
         expanded_alloc_size = 64;
-    ptr->size += expansion_size;
+    ptr->size += size_to_add;
     while(ptr->size > expanded_alloc_size){
         expanded_alloc_size *= 2;
     }