How do I create a queue that can insert and delete more than one data value with the data value being string? Please and thanks

Question

Here's my program it's still not working the way I want it to

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
# define max 50
typedef struct patient_data{
char fname[10],lname[10],address[10],condition[10],symptoms[12];
int patient_num;
};
queue[max];
int insq(char queue[max][80], int *rear, char p_data[80])
{
if(*rear == max -1)
return(-1);
else
{
*rear = *rear + 1;
strcpy(queue[*rear], p_data);
return(1);
}
}
int delq(char queue[max][80], int *front, int *rear, char p_data[80])
{
int i;
if ((front==-1) && (rear==-1))
{
printf("\nQueue is empty no elements to delete");
return;
}
for (i = 0; i <= rear; i++)
{
if (p_data == queue[i])
{
for (; i < rear; i++)
{
queue[i] = queue[i + 1];
}
queue[i] = -99;
rear--;
if (rear == -1)
front = -1;
return;
}
}
printf("\n%d not found in queue to delete", p_data);

/*if(*front == *rear)
return(-1);
else
{
(*front)++;
strcpy(p_data, queue[*front]);
return(1);
}

Answer 1

Oh no,i wasn't aware of this thanks

Answer 2

this is what I have to display the queue:
void display_pqueue(char queue[max][80], int *front, int *rear, char p_data[80])
{
if ((front == -1) && (rear == -1))
{
printf("\nQueue is empty");
return;
}
for (; front <= rear; front++)
{
printf(" %s ", p_data[front]);
}
front = 0;

Answer 3

this is the main still not quite finished

int main()
{
struct patient_data p_data;
char queue[max][80],fname[10],lname[10],address[10],condition[10],symptoms[12];
int front, rear, reply, patient_num;
int ch;
front = rear = -1; //... Initialize a Queue
printf("------------------------------\n");
printf("\tMenu");
printf("\n------------------------------");
printf("\n 1. Insert a patient record");
printf("\n 2. Delete a paiient record");
printf("\n 3. Display patient record in the System");
printf("\n 4. Exit");
printf("\n------------------------------\n");
while(1)
{
printf("Choose operation : ");
scanf("%d", &ch);
switch(ch)
{
case 1 : // insert
printf("\nEnter patient first name : ");
scanf("%s",fname);
printf("\nEnter patient last name:");
scanf("%s",lname);
printf("\nEnter patient number:");
scanf("%d",&patient_num);
printf("\nEnter patient address:");
scanf("%s",address);
printf("\nEnter patient Symptoms:");
scanf("%s",symptoms);
printf("\nEnter patient conditions:");
scan