Crear cuenta
int main(void) {
char source[] = "AkkkiiikkkikkkilllloaA";
char dest[100];
char *s ,*d, *p;
s = source; d = dest;for (p = s; *p ; p = s++)
if( *p != *s)
*d++ = *p;
*d++ = 0x0;
printf("%s",dest);
return 0;
}/*
* Ejemplo sustituyendo repetidos en la matriz original.
* /
int main(void) {
char source[] = "vvaallaa---111---222---333---444---vallaaa";
char *s , *p;
p = s = source;
for (; *s ; s++)
if( *p != *s)
*++p = *s;
*++p = 0x0;
printf("%s",source);
return 0;
}for(i=0;frase[i];i++)
{ flag=0;for(j=0;j<i;j++)
{if(letras[j]==frase[i])
{ flag=1; } }if(flag==0)
{letras[k]=frase[i];
k++;
}}/*
* Ejemplo sin el apañado y horroroso FLAG :)
*/int main(void) {
char frase[] = "aabbccddeeffgghhiijjkk";
char letras [100];
int len = 0;int i ;
int x = 0;len = strlen(frase);
for (i = 0; i < len; i++){
if (frase[i] != frase[i + 1]){
letras[x] = frase[i] ;
x++;
} }letras[x] = 0x0;
printf("%s",letras);
return 0;
}#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* */int main(int argc, char *argv[]) {
char *orig = "Pablito clavó un clavito";
char dest[strlen(orig) + 1];
int i, j;dest[0] = 0;
for(i = 0, j = 0; orig[i]; i++) {
if(strchr(dest, orig[i]) == NULL) {
dest[j++] = orig[i];
dest[j] = 0;
} }printf("'%s' -> '%s'\n", orig, dest);
}/tmp$ make kk
cc kk.c -o kk
/tmp$ ./kk'Pablito clavó un clavito' -> 'Pablito cvóun'
/tmp$