diff --git a/src/lst/lst.h b/src/lst/lst.h
index d14f38a..ec5c4d2 100644
--- a/src/lst/lst.h
+++ b/src/lst/lst.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <stddef.h>
+#include <stdlib.h>
 
 typedef struct s_lst
 {
diff --git a/src/lst/lst_clear.c b/src/lst/lst_clear.c
new file mode 100644
index 0000000..423ea4b
--- /dev/null
+++ b/src/lst/lst_clear.c
@@ -0,0 +1,16 @@
+#include "./lst.h"
+
+void lst_clear(lst **root, void (*del)(void *))
+{
+	lst* current = *root;
+	lst* next;
+
+	while (current != NULL)
+	{
+		next = current->next;
+		(*del)(current->content);
+		free(current);
+		current = next;
+	}
+	free(root);
+}
diff --git a/src/lst/lst_iter.c b/src/lst/lst_iter.c
index fb8210c..95ce94b 100644
--- a/src/lst/lst_iter.c
+++ b/src/lst/lst_iter.c
@@ -6,7 +6,7 @@ void lst_iter(lst** root, void (*f)(void *))
 
 	while (current != NULL)
 	{
-		(*f)(current);
+		(*f)(current->content);
 		current = current->next;
 	}
 }
diff --git a/src/str/str_shift.c b/src/str/str_shift.c
index d735746..781bb23 100644
--- a/src/str/str_shift.c
+++ b/src/str/str_shift.c
@@ -2,8 +2,10 @@
 
 void str_shift(char *str, int shift)
 {
-	for (size_t i = 0; str[i] == '\0'; i++)
+	size_t i = 0;
+	while (str[i - shift - 1] != '\0')
 	{
-
+		str[i] = str[i - shift];
+		i++;
 	}
 }