/* The C Programming Language
   My answer to exercise 2-4 */

#include <stdio.h>
#include <string.h>

void remdupe(char[], char[]);

int main(int argc, char* argv[])
{
    char s[] = "this is a sentence";
    char remove[] = "isa";

    remdupe(s,remove);

    printf("%s", s);
    return 0;
}

/* Remove all characters from s1 that
   are existant in s2 */
void remdupe(char *s1, char *s2)
{
    int i,j,k, m;
    i = j = k = m = 0;

    for( i = k = 0; i < strlen(s1); ++i ){
        for (j = m = 0; j < strlen(s2); ++j){
            if (s1[i] == s2[j]){
                m = 1;
                j = strlen(s2);\
            }
        }

        if (m != 1)
            s1[k++] = s1[i];
    }

    s1[k] = '\0';
}

th   entence