void memExacta_str(char ** input, char ** &output, int numElem){
    output = new char*[numElem+1];
    for (int i=0; i<numElem; i++){
        int size = strlen(input[i])+1;
        output[i] = new char[size];
        strcpy(output[i], input[i]);
    }
    output[numElem] = NULL;
}

int verifica(char c){
    //return isblank(c) || c=='\n' || c==',';
    return c==',' ;
}

void splitTokens(char * linea, char ** &palabras, int & numPal){
    numPal = 0;
    char * auxPal[25]; //tamaño maximo de palabras
    if (!verifica(linea[0])){
        auxPal[numPal] = linea;
        numPal++;
    }
    for (int i=1; linea[i]!='\0'; i++){
        //buscamos el inicio de los tokens
        if (!verifica(linea[i]) && (verifica(linea[i-1]) || linea[i-1]=='\0')){
            auxPal[numPal] = &linea[i];
            numPal++;
        }
        //buscamos el fin de los tokens
        if(verifica(linea[i]) && !verifica(linea[i-1])){
            linea[i] = '\0';
        }
    }
    memExacta_str(auxPal, palabras, numPal);
}