char *escape_string(char *src) {
    int i=0,j=0;
    char *dest = malloc(strlen(src) * 2);

    for (i=0;src[i]!='\0';i++) {
        if ((src[i] == '\\') || (src[i] == '\'')) {
            dest[j++] = '\\';
        }
        dest[j++] = src[i];
    }
    dest[j] = '\0';
    return dest;
}