Insert a string in a single linked list - c

Question

I am trying to insert a string into a linked list of other strings.
The goal is to have the user enter whatever string they want (str_insert). Then, the user has to enter after which word they want to insert the string (new_node).
Unfortunately, the code manages to insert the word but it only ever inserts it in second position. The function used to insert the word is called insertion.
typedef struct dll {
char data;
int count;
struct dll* next;
} dll;
typedef struct dictionary {
dll * data;
struct dictionary* next;``
struct dictionary* prev;
} dictionary;
dll* entry(){
char data = getc(stdin);
if (data != '\n'){
dll* curr = create_dico(data);
curr->next=entry();
return curr;
}
return NULL;
}
dictionary* insertion(dictionary *dico) {
printf("Please enter the string you want to insert in your already
existing list: \n");
dictionary * str_insert = malloc(sizeof(dictionary));
str_insert->data = entry();
str_insert->next = NULL;
printf("Please enter after which word you would like to insert the
previous entry: \n");
dictionary* new_node =(dictionary*)malloc(sizeof(dictionary));
new_node->data = entry();
new_node->next = dico->next;
new_node->prev = dico;
if (dico->next != NULL) {
str_insert->next = dico->next;
dico->next = str_insert;
}
}

Answer 1

I managed to make it work by implementing another function that compared the input with the already existing list.
Here is the final result:
dictionary* research(dictionary* dico, dll *search){
dll *save = search;
while (dico != NULL) {
dll *tmp = dico->data;
search = save;
while(tmp->data == search->data && tmp->next != NULL && search->next != NULL){
tmp = tmp->next;
search = search->next;
}
if(tmp->data == search->data){
return dico;
}
dico = dico->next;
}
return NULL;
}
void insertion(dictionary *dico) {
printf("Please enter the string you want to insert in your already existing list: \n");
dictionary * str_insert = malloc(sizeof(dictionary));
str_insert->data = entry();
str_insert->next = NULL;
printf("Please enter after which word you would like to insert the previous entry: \n");
dictionary* search =(dictionary*)malloc(sizeof(dictionary));
search->data = entry();
search = research(dico, search->data);
if (search == NULL){
printf("Sorry, this word isn't in the list.\n");
}
else{
if(search->next != NULL){
search->next->prev = str_insert;
}
str_insert->next = search->next;
search->next = str_insert;
str_insert->prev = search;
}
}