diff --git a/.vscode/settings.json b/.vscode/settings.json
index d3f7dba..b789f66 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -12,6 +12,7 @@
         "ostream": "cpp",
         "sstream": "cpp",
         "streambuf": "cpp",
-        "system_error": "cpp"
+        "system_error": "cpp",
+        "stdexcept": "cpp"
     }
 }
\ No newline at end of file
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 422a5fd..ece755c 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -18,7 +18,7 @@
         },
         {
             "label": "Clean",
-            "detail": "Clean build directory",
+            "detail": "Clean build directory and executable",
             "type": "shell",
             "command": "make",
             "args": [
diff --git a/Makefile b/Makefile
index c4db483..657edca 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # Compiler flags
-CFLAGS = -std=c++17
+CFLAGS = -std=c++17 -O3
 
 # Defaul target
 all: build_dir json2bin_converter
diff --git a/README.md b/README.md
index 56d9b86..5ceb3fe 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ You can reuse and modify it by anyway, just give credits and i'll be happy !
 Manual
 ======
 
-Put your struct and load function into bin.cpp and bin.hpp and compile it with "make", you can then use the ouputed binary "json2bin_converter" with the json input file and the binary output file which will be (re)created when the command is executed.
+Put your struct, load, write and free function into bin.cpp and bin.hpp and compile it with "make", you can then use the ouputed binary "json2bin_converter" with the json input file and the binary output file which will be (re)created when the command is executed.
 
 Exemple :
 
diff --git a/src/bin.cpp b/src/bin.cpp
index 825807c..e119867 100644
--- a/src/bin.cpp
+++ b/src/bin.cpp
@@ -1,7 +1,171 @@
+#include <cstdlib>
+#include <vector>
+#include <map>
+#include <iostream>
+
 #include "bin.hpp"
 
--void load_json_into_bin(json *json_input, Bin *bin_output)----
+void load_json_into_bin(json *json_input, bin_t *bin_output)
 {
-    bin_output->value = (*json_input)["value"].get<uint8_t>();
-    bin_output->str = (*json_input)["str"].get<std::string>().c_str();
+    // value
+    bin_output->value = (*json_input)["value"].get<int>();
+
+    // str
+    std::string str = (*json_input)["str"];
+    bin_output->str_size = str.size();
+    bin_output->str = (char *)malloc(bin_output->str_size * sizeof(char));
+
+    for(size_t i = 0; i < bin_output->str_size; i++)
+    {
+        bin_output->str[i] = str[i];
+    }
+
+    // list
+    std::vector<int> list = (*json_input)["list"];
+    bin_output->list_size = list.size();
+    bin_output->list = (int *)malloc(bin_output->list_size * sizeof(int));
+
+    for(size_t i = 0; i < bin_output->list_size; i++)
+    {
+        bin_output->list[i] = list[i];
+    }
+
+    // object -> value2
+    bin_output->object.value2 = (*json_input)["object"]["value2"].get<int>();
+
+    // object -> str2
+    std::string str2 = (*json_input)["object"]["str2"];
+    bin_output->object.str2_size = str2.size();
+    bin_output->object.str2 = (char *)malloc(bin_output->object.str2_size * sizeof(char));
+
+    for(size_t i = 0; i < bin_output->object.str2_size; i++)
+    {
+        bin_output->object.str2[i] = str2[i];
+    }
+
+    // object -> list2
+    std::vector<int> list2 = (*json_input)["object"]["list2"];
+    bin_output->object.list2_size = list2.size();
+    bin_output->object.list2 = (int *)malloc(bin_output->object.list2_size * sizeof(int));
+
+    for(size_t i = 0; i < bin_output->object.list2_size; i++)
+    {
+        bin_output->object.list2[i] = list2[i];
+    }
+
+    // object_list
+    std::vector<json> object_list = (*json_input)["object_list"];
+    bin_output->object_list_size = object_list.size();
+    bin_output->object_list = (person_t *)malloc(bin_output->object_list_size * sizeof(person_t));
+
+    for(size_t i = 0; i < bin_output->object_list_size; i++)
+    {
+        json object = object_list[i];
+
+        std::string name = object["name"];
+        bin_output->object_list[i].name_size = name.size();
+        bin_output->object_list[i].name = (char *)malloc(bin_output->object_list[i].name_size * sizeof(char));
+
+        for(size_t j = 0; j < bin_output->object_list[i].name_size; j++)
+        {
+            bin_output->object_list[i].name[j] = name[j];
+        }
+
+        bin_output->object_list[i].age = object["age"].get<int>();
+
+        std::vector<std::string> passions = object["passions"];
+        bin_output->object_list[i].nb_passions = passions.size();
+        bin_output->object_list[i].passions_size = (size_t *)malloc(bin_output->object_list[i].nb_passions * sizeof(size_t));
+
+        size_t passions_total_size = 0;
+
+        for(size_t j = 0; j < bin_output->object_list[i].nb_passions; j++)
+        {
+            bin_output->object_list[i].passions_size[j] = passions[j].size();
+            passions_total_size += passions[j].size();
+        }
+
+        bin_output->object_list[i].passions = (char *)malloc(passions_total_size * sizeof(char));
+
+        size_t last_passion_pos = 0;
+        for(size_t j = 0; j < bin_output->object_list[i].nb_passions; j++)
+        {
+            for(size_t k = 0; k < bin_output->object_list[i].passions_size[j]; k++)
+                bin_output->object_list[i].passions[k + last_passion_pos] = passions[j][k];
+
+            std::cout << passions[j] << std::endl;
+            std::cout << bin_output->object_list[i].passions << std::endl;
+
+            last_passion_pos += bin_output->object_list[i].passions_size[j];
+        }
+    }
 }
+
+void write_bin_into_file(bin_t *bin_output, std::ofstream *bin_output_file)
+{
+    // value
+    bin_output_file->write(reinterpret_cast<char*>(&bin_output->value), sizeof(int));
+
+    // str
+    bin_output_file->write(reinterpret_cast<char*>(&bin_output->str_size), sizeof(size_t));
+    bin_output_file->write(reinterpret_cast<char*>(bin_output->str), bin_output->str_size * sizeof(char));
+
+    // list
+    bin_output_file->write(reinterpret_cast<char*>(&bin_output->list_size), sizeof(size_t));
+    bin_output_file->write(reinterpret_cast<char*>(bin_output->list), bin_output->list_size * sizeof(int));
+
+    // object -> value2
+    bin_output_file->write(reinterpret_cast<char*>(&bin_output->object.value2), sizeof(int));
+
+    // object -> str2
+    bin_output_file->write(reinterpret_cast<char*>(&bin_output->object.str2_size), sizeof(size_t));
+    bin_output_file->write(reinterpret_cast<char*>(bin_output->object.str2), bin_output->object.str2_size * sizeof(char));
+
+    // object -> list2
+    bin_output_file->write(reinterpret_cast<char*>(&bin_output->object.list2_size), sizeof(size_t));
+    bin_output_file->write(reinterpret_cast<char*>(bin_output->object.list2), bin_output->object.list2_size * sizeof(int));
+
+    // object_list
+    bin_output_file->write(reinterpret_cast<char*>(&bin_output->object_list_size), sizeof(size_t));
+    for (size_t i = 0; i < bin_output->object_list_size; i++)
+    {
+        person_t& person = bin_output->object_list[i];
+
+        // name
+        bin_output_file->write(reinterpret_cast<char*>(&person.name_size), sizeof(size_t));
+        bin_output_file->write(reinterpret_cast<char*>(person.name), person.name_size * sizeof(char));
+
+        // age
+        bin_output_file->write(reinterpret_cast<char*>(&person.age), sizeof(int));
+
+        // passions
+        bin_output_file->write(reinterpret_cast<char*>(&person.nb_passions), sizeof(size_t));
+        bin_output_file->write(reinterpret_cast<char*>(person.passions_size), person.nb_passions * sizeof(size_t));
+
+        size_t passions_total_size = 0;
+
+        for(size_t j = 0; j < person.nb_passions; j++)
+        {
+            passions_total_size += person.passions_size[j];
+        }
+
+        bin_output_file->write(person.passions, passions_total_size);
+    }
+}
+
+void free_bin(bin_t *bin)
+{
+    free(bin->list);
+    bin->list = nullptr;
+    bin->list_size = 0;
+    free(bin->str);
+    bin->str = nullptr;
+    bin->str_size = 0;
+
+    free(bin->object.list2);
+    bin->object.list2 = nullptr;
+    bin->object.list2_size = 0;
+    free(bin->object.str2);
+    bin->object.str2 = nullptr;
+    bin->object.str2_size = 0;
+}
\ No newline at end of file
diff --git a/src/bin.hpp b/src/bin.hpp
index 2310af9..2f08a90 100644
--- a/src/bin.hpp
+++ b/src/bin.hpp
@@ -1,15 +1,45 @@
 #ifndef BIN_H
 #define BIN_H
 
+#include <fstream>
 #include "json/json.hpp"
 
 using nlohmann::json;
 
-struct Bin {
-    uint8_t value;
-    const char *str;
-};
+typedef struct object_t {
+    int value2;
+    size_t list2_size;
+    int *list2;
+    size_t str2_size;
+    char *str2;
+} object_t;
 
-void load_json_into_bin(json *json_input, Bin *bin_output);
+typedef struct person_t {
+    size_t name_size;
+    char *name;
+    int age;
+    size_t nb_passions;
+    size_t *passions_size;
+    char *passions;
+} person_t;
 
-#endif // BIN_H
+typedef struct bin_t {
+    int value;
+    size_t list_size;
+    int *list;
+    size_t str_size;
+    char *str;
+
+    object_t object;
+
+    size_t object_list_size;
+    person_t *object_list;
+} bin_t;
+
+void load_json_into_bin(json *json_input, bin_t *bin_output);
+
+void write_bin_into_file(bin_t *bin_output, std::ofstream *bin_output_file);
+
+void free_bin(bin_t *bin);
+
+#endif // BIN_H
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 5b7fc23..4f6d3a4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,4 +1,3 @@
-#include <fstream>
 #include <iostream>
 
 #include "bin.hpp"
@@ -28,11 +27,13 @@ int main(int argc, char *argv[])
     }
 
     json json_input = json::parse(json_input_file);
-    Bin bin_output;
+    bin_t bin_output;
 
     load_json_into_bin(&json_input, &bin_output);
 
-    bin_output_file.write(reinterpret_cast<char*>(&bin_output), sizeof(Bin));
+    write_bin_into_file(&bin_output, &bin_output_file);
+
+    free_bin(&bin_output);
 
     return EXIT_SUCCESS;
 }
diff --git a/test.bin b/test.bin
index 1698fc7..9d4b69e 100644
Binary files a/test.bin and b/test.bin differ
diff --git a/test.json b/test.json
index 74f4271..4884e5c 100644
--- a/test.json
+++ b/test.json
@@ -1,4 +1,50 @@
 {
-    "value": 10,
-    "str": "ABC"
+    "value": 42,
+    "str": "You should eat more bread",
+    "list": [
+        3,
+        5,
+        7
+    ],
+
+    "object": {
+        "value2": 24,
+        "str2": "XD",
+        "list2": [
+            4,
+            6,
+            8
+        ]
+    },
+
+    "object_list": [
+        {
+            "name": "Aaron",
+            "age": 12,
+            "passions": [
+                "Showering",
+                "Eating",
+                "Parking"
+            ]
+        },
+        {
+            "name": "Suzann",
+            "age": 27,
+            "passions": [
+                "Sleeping",
+                "Horsing",
+                "Parachuting"
+            ]
+        },
+        {
+            "name": "Heliott",
+            "age": 35,
+            "passions": [
+                "Watching",
+                "Baking",
+                "Running"
+            ]
+        }
+
+    ]
 }
\ No newline at end of file