Lista simples

#include <stdio.h>
#include <stdlib.h>

typedef struct item {
    char content;
    struct item* next;
} item;

void addItem(item* first, char content){
    item* act;

    if(first == NULL){
        first = malloc(sizeof(item));
        first->content = content;
        first->next = NULL;
    }else{
        act = first;
        //Percorre a lista até o último item
        while(act->next != NULL)
            act = act->next;
        act->next = malloc(sizeof(item));
        act->next->content = content;
        act->next->next = NULL;
    }
}

void print(item* first){
    item* temp = first;

    while(temp != NULL){
        printf("%c", temp->content);
        temp = temp->next;
    }
}

int main(){
    item* first;
    first = NULL;

    //Adicionar primeiro item pelo main
    /*first = malloc(sizeof(item));
    first->content = 'a';
    first->next = NULL;*/

    addItem(first, 'b');
    addItem(first, 'c');
    addItem(first, 'd');

    print(first);

    printf("\n");
    return 0;
}