diff --git a/sf-writer/src/ImageAssembler.cpp b/sf-writer/src/ImageAssembler.cpp
index d5d1e9d..f654fd4 100644
--- a/sf-writer/src/ImageAssembler.cpp
+++ b/sf-writer/src/ImageAssembler.cpp
@@ -24,16 +24,6 @@ void ImageAssembler::process(
 
 }
 
-void ImageAssembler::get_free_slot()
-{
-
-}
-
-void ImageAssembler::get_full_slot()
-{
-
-}
-
 void ImageAssembler::free_slot(const int slot_id)
 {
 
diff --git a/sf-writer/src/ImageAssembler.hpp b/sf-writer/src/ImageAssembler.hpp
index 845bcfb..d2c4540 100644
--- a/sf-writer/src/ImageAssembler.hpp
+++ b/sf-writer/src/ImageAssembler.hpp
@@ -13,18 +13,19 @@ class ImageAssembler {
 
 public:
     ImageAssembler(const size_t n_modules);
-    ImageMetadataBlock* get_metadata_buffer(const int slot_id);
+
     virtual ~ImageAssembler();
 
+    int get_free_slot();
     void process(const int slot_id,
                  const int i_module,
                  const BufferBinaryBlock* block_buffer);
-    int get_free_slot();
+
     int get_full_slot();
     void free_slot(const int slot_id);
 
-
-    const char* get_data_buffer(const int slot_id);
+    ImageMetadataBlock* get_metadata_buffer(const int slot_id);
+    char* get_data_buffer(const int slot_id);
 };