diff --git a/AcquiringLand/Fundamentals/insert_string.c b/AcquiringLand/Fundamentals/insert_string.c
new file mode 100644
index 0000000..3ad218b
--- /dev/null
+++ b/AcquiringLand/Fundamentals/insert_string.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+char **insert_string(char **strings_array, int *array_size, char *insert_str, int index){
+
+    
+    char **rslt = malloc(array_size + 1 * sizeof(char));
+
+    int index = 0;
+    while (*(strings_array + index)){
+
+        
+    }
+    
+}
diff --git a/AcquiringLand/Fundamentals/itoa.c b/AcquiringLand/Fundamentals/itoa.c
new file mode 100644
index 0000000..766a9a7
--- /dev/null
+++ b/AcquiringLand/Fundamentals/itoa.c
@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int get_number_length(int value){
+
+    if (value > 0 && value < 10) return 1;
+
+    int clc = 0;
+    if (value < 0) {
+        value = value * -1;
+        clc ++;
+    }
+    while (value > 10 ){
+        clc ++;
+        value = value / 10;
+    }
+    
+    return clc + 1;
+}
+
+char *my_itoa(int value){
+
+    int taille = get_number_length(value);
+
+    char *rslt = malloc(taille + 1 * sizeof(char));
+    
+    if (value < 0){
+        value = value * -1;
+        *rslt = '-';
+    }
+    
+    *(rslt + taille) = '\0';
+    
+    if(value < 10){
+        if( *rslt == '-')*(rslt + 1) = value + 48;
+        else *(rslt) = value + 48;
+        return rslt;
+    }
+
+    taille --;
+    while (taille > 0){
+        *(rslt + taille) = 48 +value % 10;
+        value = value / 10;
+        taille --;
+    }
+
+    return rslt;
+}
+
+int main(){
+    printf("TESTS 1 \n"); 
+    printf("%i\n", get_number_length(7));       //1
+    printf("%i\n",get_number_length(-97163));  //6
+    printf("%i\n",get_number_length(82622));   //5
+
+    printf("TESTS 2\n");
+    char *rslt = "";
+
+    rslt = my_itoa(-172);     // "-172"
+    printf("%s\n", rslt);
+    free(rslt);
+    rslt = my_itoa(2);        // "2"
+    printf("%s\n", rslt);
+    free(rslt);
+    rslt = my_itoa(-2829302); // "-2829302"
+    printf("%s\n", rslt);
+    free(rslt);
+
+}
diff --git a/AcquiringLand/Fundamentals/join_strings.c b/AcquiringLand/Fundamentals/join_strings.c
new file mode 100644
index 0000000..e69de29
diff --git a/AcquiringLand/Fundamentals/magic_arrays.c b/AcquiringLand/Fundamentals/magic_arrays.c
new file mode 100644
index 0000000..e69de29
diff --git a/AcquiringLand/Fundamentals/minefield.c b/AcquiringLand/Fundamentals/minefield.c
index 48c1dad..36cbc1b 100644
--- a/AcquiringLand/Fundamentals/minefield.c
+++ b/AcquiringLand/Fundamentals/minefield.c
@@ -101,7 +101,7 @@ void hash_map_free(struct hash_map *hash_map)
     }
     free(hash_map->data);
     free(hash_map);
-    hash_map->data = NULL;
+    //hash_map->data = NULL;
 }
 
 void hash_map_dump(struct hash_map *hash_map)
@@ -160,8 +160,9 @@ bool hash_map_remove(struct hash_map *hash_map, const char *key)
         prev->next = elt->next;
     else
         hash_map->data[hashed_val] = elt->next;
-    free(elt);
+    //free(elt);
     printf("removed %s", elt->value);
+    free(elt);
     return true;
 }
 
diff --git a/AcquiringLand/Proficiencies/normalize_array.c b/AcquiringLand/Proficiencies/normalize_array.c
new file mode 100644
index 0000000..e69de29
diff --git a/AcquiringLand/Proficiencies/split_by_sum.c b/AcquiringLand/Proficiencies/split_by_sum.c
new file mode 100644
index 0000000..e69de29
diff --git a/AcquiringLand/Proficiencies/unique_words.c b/AcquiringLand/Proficiencies/unique_words.c
new file mode 100644
index 0000000..e69de29