// token contains '111'

char *token;
char smr[4];

Serial.println(stripZeroesPlus(token, smr))

// => 1


void stripZeroesPlus(char *token, char *buffer) {
    char *temp;
    memcpy(temp, token+4, 3);
    int num = atoi(temp);
    itoa(num, buffer, 10);
}