How to do search function for bus - c

Question

I want to do a search function for this program at void search(void);.
In this function, the user will enter the information at void arrive(void);.
After that, I going to scan the char that user typed, which is bus_num[20], and the program is going to show the bus_type and capacity. Can somebody teach me how to do this ?
#include<conio.h>
#include<stdio.h>
#include<malloc.h>
void arrive(void);
void leave(void);
void search(void);
void print(void);
void length(void);
int count;
struct bus{
char bus_num[20];
char bus_type[20];
int capacity;
struct bus *next;
}*ptr, *temp, *front, *rear;
void main()
{
temp = NULL;
rear = NULL;
front = NULL;
int option = 0;
while (option != 6)
{
printf("\n\n*****menu driven*****\n");
printf("\n\t 1.Arrive");
printf("\n\t 2.Leave");
printf("\n\t 3.Search");
printf("\n\t 4.Print");
printf("\n\t 5.Length");
printf("\n\t 6.Exit");
printf("\n\nSelect a option\n");
scanf("%d", &option);
switch (option)
{
case 1: arrive();break;
case 2:leave();break;
case 3:search();break;
case 4:print();break;
case 5:length();break;
case 6:break;
default: printf("\nInvalid Option\n");
}
getch();
}
getch();
}
void arrive(void)
{
temp = (struct bus*)malloc(1 * sizeof(struct bus));
printf("\nPlease Enter The Bus Registeration Number :");
fflush(stdin);
scanf("%s", &temp->bus_num);
printf("\nPlease Enter The Bus Type :");
fflush(stdin);
scanf("%s", &temp->bus_type);
printf("\nPlease Enter The Bus Capacity :");
fflush(stdin);
scanf("%d", &temp->capacity);
count++;
temp->next = NULL;
if (front == NULL && rear == NULL)
{
front = rear = temp;
return;
}
rear->next = temp;
rear = rear->next;
}
void leave(void)
{
if (front == NULL)
{
printf("\nThere are empty queue\n");
return;
}
if (front == rear&&front != NULL)
{
ptr = front;
printf("%s leaves the queue", &ptr->bus_num);
front = rear = NULL;
free(ptr);
}
else
{
ptr = front;
printf("%s leaves", &ptr->bus_num);
front = front->next;
free(ptr);
}
count--;
}
void print(void)
{
if (front == NULL&&rear == NULL)
{
printf("\nThere are no any Queue\n");
return;
}
ptr = front;
while (ptr != NULL)
{
printf("%s\t", ptr->bus_num);
ptr = ptr->next;
}
}
void length(void)
{
printf("\n Queue size is %d", count);
}
void search(void)
{
}