char *readCredentials(){
    /*Put the content from credentials.json in a buffer.*/
    char *credentials = (char *) malloc(SIZE * SIZE);
    memset(credentials, 0, sizeof(char) * SIZE * SIZE);
    FILE *f = fopen(CREDENTIALS, "rb");
    int count = 0;
    while((credentials[count++] = fgetc(f)) != EOF);
    return credentials;
}