#include <stdio.h>
#include <string.h>
char* remove_chars(char* s, char* chars) {
int i = 0, internal_i = 0;
while (*(s + i)) {
char ch = *(s + i);
if (!strchr(chars, ch)) {
*(s + internal_i) = *(s + i);
internal_i++;
}
i++;
}
*(s + internal_i) = '\0';
return s;
}
int main(void)
{
char s[] = "c programming language";
char chars[] = "rog";
printf("%s\n", remove_chars(s, chars));
return 0;
}
/*
run:
c pammin lanuae
*/