my_funk(PGconn** conn_1, PGresult** res_1)

my_funk(&conn_1, &res_1)

PGconn*    conn_1;
PGresult*  res_1;

struct pair {
    char* key;
    PGconn* conn;
};

struct pair *arr = malloc(sizeof(struct pair) * N);

arr[0].key = "172.0.0.1";
arr[0].conn = PQconnectdb("host=172.0.0.1 -U postgres");

arr[1].key = "172.0.0.2";
arr[1].conn = PQconnectdb("host=172.0.0.2 -U postgres");

arr[2].key = "172.0.0.3";
arr[2].conn = PQconnectdb("host=172.0.0.3 -U postgres");

//и т.д.

char* massive_var[0][0]; 
massive_var[0][0] = (char*)calloc(10000, sizeof(char));
massive_var[0][0] = "first_record";

#include <stdio.h>
 
struct person 
{
    int age;
    char name[20];
};
 
int main(void)
{
    struct person people[] = {23, "Tom", 32, "Bob", 26, "Alice", 41, "Sam"};
    int n = sizeof(people)/sizeof(people[0]);
    for(int i=0; i<n; i++)
    {
        printf("Name:%s \t Age: %d \n", people[i].name, people[i].age);
    }
    return 0;
}

struct pair {
    char* key;
    PGconn* conn;
};

struct pair *arr = malloc(sizeof(struct pair) * N);

struct pair {
    char[100] key;
    PGconn* conn;
};