Ordenate and remove duplicate cases of an array passed as a c function argument

[camposacrs]

These are the arguments of a c function that I have to manipulate. I want to ordenate the array pointed by *response, and after it, remove its duplicated elements.

double getCustomSplitStatisticMultivariateRegression (unsigned int n,
                                                      char *membership,
double *time,
double *event,

unsigned int eventTypeSize,
unsigned int eventTimeSize,
double *eventTime,

double *response,
double mean,
double variance,
unsigned int maxLevel,

double **feature,
unsigned int featureCount)
    {

Do you have any idea how to proceed?