fix whole code for full compilation

linkedlist.c

@@ -2,6 +2,7 @@
 
 envstruct *insert_end(envstruct *head, char *key, char *value)
 {
+	envstruct *curr = head;
 	envstruct *new_node = malloc(sizeof(envstruct));
 
 	if (new_node == NULL)
@@ -18,8 +19,6 @@ envstruct *insert_end(envstruct *head, char *key, char *value)
 		return (new_node);
 	}
 
-	envstruct *curr;
-	curr = head;
 
 	while (curr->next != NULL)
 	{
@@ -67,14 +66,14 @@ char *get_value(envstruct *head, char *key)
 */
 int remove_value(envstruct **head, char *key)
 {
+	envstruct *curr = *head;
+	envstruct *prev = NULL;
+
 	if (head == NULL || *head == NULL)
 	{
 		return (1);
 	}
 
-	envstruct *curr = *head;
-	envstruct *prev = NULL;
-
 	while (curr != NULL)
 	{
 		if (strcmp(curr->key, key) == 0)

main.c

@@ -10,9 +10,10 @@ char *lineptr;
  */
 int main(void)
 {
+	envstruct *head = NULL;
+
 	atexit(clean_up);
 	signal(SIGINT, sig_int_handler);
-	envstruct *head = NULL;
 
 	while (1)
 	{
@@ -235,7 +236,9 @@ void env_cmd(void)
  */
 void init_env_list(envstruct *head)
 {
-	while (*environ != NULL)
+	int i = 0;
+
+	while (environ[i] != NULL)
 	{
 		char *key = strtok(*environ, "="), *val = NULL;
 
@@ -246,7 +249,7 @@ void init_env_list(envstruct *head)
 		}
 		head = insert_end(head, key, val);
 
-		*environ++;
+		i++;
 	}
 }