char * delChar(char * s, char q)
{
    for(char * c = s; *c; ++c)
    {
        while(*c == q)
            memmove(c,c+1,strlen(c)+1);
        if (*c == 0) break;
    }
    return s;
}

int main(int argc, const char * argv[])
{
    char s[] = "Hello, Dolly!";
    printf("%sn",s);
    printf("%sn",delChar(s,'o'));
    printf("%sn",delChar(s,'!'));
}