uninitialized pointer of structure to the function

I am trying to learn C programming, but I got stuck when I was trying to pass an uninitialized pointer of structure to the function.

This is my structure:

typedef struct {
    char name[30];
    char surname[30];
    char gender;
    char DOB[10];
    int waist;
    int hip;
}healthcare_table;

my main

int main() {
    healthcare_table *records;
    int step = 1;
    load_healthcare_table(records,&step);
    return 0;
}

My function will open the file and according to the number of lines in the text file, it will initialize the pointers, but I cannot do it. Any suggestion?

UPDATE: I am taking such that error, I do not know what is wrong. Error message is :Exception thrown at 0x00D7529C in ConsoleApplication1.exe: 0xC0000005: Access violation reading location 0x0000004C.

And this is my updated code:

typedef struct {
	char name[30];
	char surname[30];
	char gender;
	char DOB[10];
	int waist;
	int hip;
}healthcare_table;

void load_healthcare_table(healthcare_table **t, int *step) {
	int i;
	FILE *infile;
	infile = fopen("records.txt", "r");
	if (infile == NULL)
		printf("File not opened successfully");
	else
		printf("File opened successfully");
	for (i = 0; fscanf(infile, "%s %s %c %s %d %d", *t[*step]->name, *t[*step]->surname, t[*step]->gender, *t[*step]->DOB, t[*step]->waist, t[*step]->hip) != EOF; i++) {
		if (fgetc(infile) == '\n') {
			*step++;
			//*t = (healthcare_table*)realloc(*t, *step);
			//fprintf(infile, "%s %s %c %s %d %d", *t[*step]->name, *t[*step]->surname, t[i]->gender, *t[*step]->DOB, t[*step]->waist, t[*step]->hip);
		}
	}
	*t = (healthcare_table*)malloc((*step) * sizeof(healthcare_table));
	for (i = 0; fscanf(infile, "%s %s %c %s %d %d", *t[i]->name, *t[i]->surname, t[i]->gender, *t[i]->DOB, t[i]->waist, t[i]->hip) != EOF; i++) {
		if (fgetc(infile) == '\n')
			fprintf(infile, "%s %s %c %s %d %d", *t[i]->name, *t[i]->surname, t[i]->gender, *t[i]->DOB, t[i]->waist, t[i]->hip);
	}

}

void display_healthcare_table(healthcare_table *records) {
	
}

void search() {

}

void WHR_interpreter() {

}

int main() {
	healthcare_table *records=NULL;
	int step = 0;
		load_healthcare_table(&records, &step);
	return 0;

}

UPDATE 2: I think problems are fscanf and fprintf. how can i solve the problem if I am wrong?

If you do not want to allocate the pointer in the main function, you have two possible solutions:

Solution 1

Do not pass the healthcare_table pointer to the load_healthcare_table() function, but rather return the initialized pointer from the function itself. Something along these lines:

int main() {
    healthcare_table *records;
    int step = 1;
    records = load_healthcare_table(&step);
    return 0;
}

In this case your load_healthcare_table() function would be:

healthcare_table* load_healthcare_table(int* step) {
    healthcare_table *table;
    table = (healthcare_table*)malloc(sizeof(healthcare_table));
    // Fill table here
    return table;
}

Important note In this case make sure you do not create the table locally to the load_healthcare_table() function. This would destroy the table once the function returns, resulting in garbage data. A function should never return a pointer to its local data. So the following example would be wrong:

healthcare_table* load_healthcare_table(int* step) {
    healthcare_table table;
    // Fill table here
    return &table;
}

Solution 2

Pass a pointer to a pointer of the healthcare_table to the function load_healthcare_table(). It would look something along these lines:

int main() {
    healthcare_table *records;
    int step = 1;
    load_healthcare_table(&records,&step);
    return 0;
}

In this case, the load_healthcare_table() function will be:

void load_healthcare_table(healthcare_table** t, int* step ) {
    *t = (healthcare_table*)malloc(sizeof(healthcare_table));
    // Fill table here
}

EDIT

As suggested by Ajay Brahmakshatriya: Sticking to standard C notion of local variables rather than going into stack terminologies.