Prompt a string in C with no buffer limits, by using dynamic string / dynamic memory allocation

dynamic_prompt.c

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

typedef struct node {
    char ch;
    struct node* next;
} node;

node* type(node* next);
node* print(node* current);

int main() {
    printf("TYPE! TYPE! TYPE! ");
    node* head = NULL;
    node* message = type(head);
    print(message);
}

node* print(node* current) {
    if (!current) return NULL;
    print(current->next); putchar(current->ch);
    free(current);
    return NULL;
}

node* type(node* next) {
    node* block = malloc(sizeof(node));
    block->next = next;
    block->ch = getchar();
    return (isalpha(block->ch)) ? type(block) : block;
}