Trying to recursively add linked nodes to my head node but it just continuously

Question

Trying to recursively add linked nodes to my head node but it just continuously loops and doesn't stop when I need it to:

struct students * insert_back(struct students * start, int numstudents){

numstudents = numstudents--;

if(numstudents==0){
return start;
}
struct students * temp = calloc(1,sizeof(struct students));
temp->firstName = calloc(29, sizeof(char));
temp->lastName = calloc(29, sizeof(char));
temp->birthMonth = calloc(9, sizeof(char));
temp->next = NULL;

fscanf(ifp, "%s", temp->firstName);
printf("%s " , temp->firstName);
fscanf(ifp, "%s", temp->lastName);
printf("%s " , temp->lastName);
fscanf(ifp, "%s", temp->birthMonth);
printf("%s " , temp->birthMonth);
fscanf(ifp, "%d", &temp->numDay);
fscanf(ifp, "%d", &temp->numYear);

struct students * head;

head = start;

start->next = temp;

head->next = insert_back(start, numstudents);

return head;
}

Explanation / Answer

struct students * insert_back(struct students * start, int numstudents){

numstudents = numstudents--;

if(numstudents==0){
return start;
}
struct students * temp = calloc(1,sizeof(struct students));
temp->firstName = calloc(29, sizeof(char));
temp->lastName = calloc(29, sizeof(char));
temp->birthMonth = calloc(9, sizeof(char));
temp->next = NULL;

fscanf(ifp, "%s", temp->firstName);
printf("%s " , temp->firstName);
fscanf(ifp, "%s", temp->lastName);
printf("%s " , temp->lastName);
fscanf(ifp, "%s", temp->birthMonth);
printf("%s " , temp->birthMonth);
fscanf(ifp, "%d", &temp->numDay);
fscanf(ifp, "%d", &temp->numYear);

struct students * head;

head = start;

start->next = temp;

head->next = insert_back(start->next, numstudents);//u have to forward the start node to append nodes...

//try this..

return head;
}

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