TeleBook2, C (gcc)

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//gcc 7.4.0
//TeleBook2: example of nested switch and nested structure blended with function returning structure and function taking structure as parameter.
//this code is created by Rezaul Hoque on March 23,2022;contact: jewelmrh@yahoo.com,Dhaka, Bangladesh
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning; 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define SZ 2

struct person{
char first[30];
char last[30];
int num;
};
struct tele {
char category[30];
struct person p[SZ];
}tel;
struct tele proform();
struct tele procur();
struct tele personal();
void display(struct tele t);
struct tele  proform(){
strcpy( tel.p[0].first,"www");
strcpy( tel.p[0].last,"ccc");
tel.p[0].num=2222;
strcpy(tel.category,"Former Coworker");
strcpy( tel.p[1].first,"aaa");
strcpy( tel.p[1].last,"tttt");
tel.p[1].num=5555;
strcpy(tel.category,"Former Coworker");
return tel;
}
struct tele  procur(){
strcpy( tel.p[0].first,"uuu");
strcpy( tel.p[0].last,"ffff");
tel.p[0].num=3216;
strcpy(tel.category,"Current Coworker");
strcpy( tel.p[1].first,"bbb");
strcpy( tel.p[1].last,"zzz");
tel.p[1].num=6543;
strcpy(tel.category,"Current Coworker");

return tel;
}
struct tele personal(){
strcpy( tel.p[0].first,"SSS");
strcpy( tel.p[0].last,"YYY");
tel.p[0].num=4321;
strcpy(tel.category,"Personal");
strcpy( tel.p[1].first,"III");
strcpy( tel.p[1].last,"PPP");
tel.p[1].num=01234;
strcpy(tel.category,"Personal");
return tel;
}
 void  display(struct tele t){
printf("Name      Phone Number  Category \n");
for(int i=0;i<SZ;i++)
printf("%s %s    %d    %s\n",t.p[i].first,t.p[i].last,t.p[i].num, t.category);
}
int main()
{
struct tele var1,var2,var3;
var1=proform();
var2=procur();
var3=personal();

int a,b;
printf("Select: \n");
printf("(1)Professional (2) Personal\n");
scanf("%d",&a);
switch(a){
case 1:
            printf("Select:\n");
            printf("(1)Former Coworkers (2)Current Coworkers\n");
          scanf("%d",&b);
           switch(b){
            case 1:
           printf("Former Office Coworker Contacts:\n");
                     display(var1);
             break;  
         case 2:
           printf("Current Office Coworker Contacts:\n");
                     display(var2);
             break;  
           }
            break;
case 2:
   printf("Personal Contacts:\n");
 display(var3);
break;
}
return 0;
}

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Compilation time: 0.23 sec, absolute running time: 0.18 sec, cpu time: 0.02 sec, memory peak: 5 Mb, absolute service time: 0,5 sec