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Prefix trees are quite useful for that.


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

struct letter {
int letter;
struct letter *leaf;

I was referring to the overall design of his program, particularly how he was storing sequences of characters into arrays then operating on them (instead of operating on them one-by-one), rather than...

You're making it way too complicated.


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

int main(void)
{
int inspace = 1, c;