diff --git a/src/lst/lst.h b/src/lst/lst.h
index f01108c..d14f38a 100644
--- a/src/lst/lst.h
+++ b/src/lst/lst.h
@@ -8,7 +8,7 @@ typedef struct s_lst
 } lst;
 
 size_t lst_len(const lst* root);
-void lst_iter(const lst* root, void (*f)(void *));
-lst* lst_find(lst* root, void (*cmp)(const lst* lst1, const lst* lst2));
+void lst_iter(lst** root, void (*f)(void *));
+lst* lst_find(lst** root, const lst* to_find, int (*cmp)(const lst* lst1, const lst* lst2));
 void lst_addback(lst** root, lst* nouveau);
 void lst_clear(lst** root, void (*del)(void *));
diff --git a/src/lst/lst_addback.c b/src/lst/lst_addback.c
new file mode 100644
index 0000000..5f80d92
--- /dev/null
+++ b/src/lst/lst_addback.c
@@ -0,0 +1,18 @@
+#include "lst.h"
+
+void lst_addback(lst **root, lst *nouveau)
+{
+	lst* current = *root;
+
+	if (root == NULL || nouveau == NULL)
+		return;
+	nouveau->next = NULL;
+	if (current == NULL)
+	{
+		current = nouveau;
+		return;
+	}
+	while (current->next != NULL)
+		current = current->next;
+	current->next = nouveau;
+}
diff --git a/src/lst/lst_find.c b/src/lst/lst_find.c
new file mode 100644
index 0000000..bc279b1
--- /dev/null
+++ b/src/lst/lst_find.c
@@ -0,0 +1,14 @@
+#include "./lst.h"
+
+lst* lst_find(lst** root, const lst* to_find, int (*cmp)(const lst* lst1, const lst* lst2))
+{
+	lst* current = *root;
+
+	while (current != NULL)
+	{
+		if ((*cmp)(to_find, current) == 0)
+			return current;
+		current = current->next;
+	}
+	return (NULL);
+}
diff --git a/src/lst/lst_iter.c b/src/lst/lst_iter.c
new file mode 100644
index 0000000..fb8210c
--- /dev/null
+++ b/src/lst/lst_iter.c
@@ -0,0 +1,12 @@
+#include "./lst.h"
+
+void lst_iter(lst** root, void (*f)(void *))
+{
+	lst *current = *root;
+
+	while (current != NULL)
+	{
+		(*f)(current);
+		current = current->next;
+	}
+}