diff --git a/fish_shell/fish_core.c b/fish_shell/fish_core.c
index 268c63e..73e384c 100644
--- a/fish_shell/fish_core.c
+++ b/fish_shell/fish_core.c
@@ -75,18 +75,6 @@ WordArray * split(char *string, char *separator){
 	return tokens;
 }
 
-void freeWordArray(WordArray *array) {
-	int i;
-	if (array != NULL) {
-		for (i = 0; i < array->size; i++) {
-			free(array->words[i]);
-		}
-		free(array->words);
-		free(array);
-	}
-
-}
-
 char *fishReadLine() {
 	size_t bufferSize = FISH_BUFFER_SIZE;
 	int position = 0;
diff --git a/fish_shell/fish_core.h b/fish_shell/fish_core.h
index d391e9f..6e31133 100644
--- a/fish_shell/fish_core.h
+++ b/fish_shell/fish_core.h
@@ -13,7 +13,6 @@
 /* WordArray functions */
 
 WordArray * split(char *string, char *separator);
-void freeWordArray(WordArray *array);
 
 /* Settings functions */
 
diff --git a/fish_shell/fish_types.h b/fish_shell/fish_types.h
index a8d5b54..717d13d 100644
--- a/fish_shell/fish_types.h
+++ b/fish_shell/fish_types.h
@@ -12,6 +12,18 @@ typedef struct {
 	int size;
 } WordArray;
 
+typedef struct elem {
+	char * word;
+	struct elem * previous;
+	struct elem * next;
+} WordListElement;
+
+typedef struct {
+	int size;
+	WordListElement * first;
+	WordListElement * last;
+} WordList;
+
 typedef struct {
 	char *PS1;
 } Settings;
diff --git a/fish_shell/fish_utils.c b/fish_shell/fish_utils.c
index ef59f02..9ee8560 100644
--- a/fish_shell/fish_utils.c
+++ b/fish_shell/fish_utils.c
@@ -4,8 +4,109 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include "fish_types.h"
 
 void crash(){
 	fprintf(stderr, "fish: Error allocating fucking pointer !");
 	exit(EXIT_FAILURE);
 }
+
+void freeWordArray(WordArray *array) {
+	int i;
+	if (array != NULL) {
+		for (i = 0; i < array->size; i++) {
+			free(array->words[i]);
+		}
+		free(array->words);
+		free(array);
+	}
+
+}
+
+
+WordList *createWordList() {
+	WordList *list = (WordList*) malloc(sizeof(WordList));
+	if (list == NULL) crash();
+	else {
+		list->size = 0;
+		list->first = NULL;
+		list->last = NULL;
+	}
+
+	return list;
+}
+
+void addWordList(WordList *list, char *word) {
+	WordListElement *new = (WordListElement*) malloc(sizeof(WordListElement));
+	if (new == NULL) crash();
+	else {
+		new->next = NULL;
+		new->previous = list->last;
+		if (list->size == 0){
+			list->first = new;
+			list->last = new;
+		} else {
+			list->last->next = new;
+			list->last = new;
+		}
+		new->word = strdup(word);
+		list->size++;
+	}
+}
+
+void removeWordList(WordList *list) {
+	WordListElement *current = list->last;
+	if (current != NULL){
+		list->last = current->previous;
+		if (current->previous != NULL)
+			current->previous->next = NULL;
+		if (current->word != NULL)
+			free(current->word);
+		free(current);
+		list->size--;
+	}
+}
+
+void freeWordList(WordList *list) {
+	while (list->size != 0)
+		removeWordList(list);
+	free(list);
+}
+
+WordArray *wordListToWordArray(WordList *list) {
+	WordArray *array = (WordArray*) malloc(sizeof(WordArray));
+	WordListElement *current = list->first;
+	int i = 0;
+
+	if (array == NULL) crash();
+	else {
+		array->size = list->size;
+		array->words = (char **) malloc(sizeof(char *) * (list->size + 1));
+		if (array->words == NULL) crash();
+
+		while (current != NULL){
+			array->words[i] = current->word;
+			current->word = NULL;
+			current = current->next;
+			i++;
+		}
+		array->words[i] = NULL;
+	}
+
+	freeWordList(list);
+
+	return array;
+}
+
+WordList *wordArrayToWordList(WordArray *array) {
+	WordList *list = createWordList();
+	int i = 0;
+
+	for (i=0; i<array->size; i++)
+		addWordList(list, array->words[i]);
+
+	freeWordArray(array);
+
+	return list;
+}
diff --git a/fish_shell/fish_utils.h b/fish_shell/fish_utils.h
index 27de991..84ddbea 100644
--- a/fish_shell/fish_utils.h
+++ b/fish_shell/fish_utils.h
@@ -5,6 +5,22 @@
 #ifndef FISH_FISH_UTILS_H
 #define FISH_FISH_UTILS_H
 
+#include "fish_types.h"
+
 void crash();
 
+void freeWordArray(WordArray *array);
+
+WordList * createWordList();
+
+void addWordList(WordList *list, char *word);
+
+void removeWordList(WordList *list);
+
+void freeWordList(WordList *list);
+
+WordArray * wordListToWordArray(WordList *list);
+
+WordList * wordArrayToWordList(WordArray * array);
+
 #endif //FISH_FISH_UTILS_H