#include <stdio.h>
#include <unistd.h>

void customFunction1(int n);
void customFunction2(int n);
void customFunction3(int n);

void customFunction1(int n) {
    if(n <= 0) {
        printf("End of recursion\n");
        while (1) {
            // sleep(1);
        } // never return, keep stack
        return;
    } else {
        printf("Calling customFunction2\n");
        customFunction2(n-1);
    }
}

void customFunction2(int n) {
    printf("Calling customFunction3\n");
    customFunction3(n);
}

void customFunction3(int n) {
    printf("Calling customFunction1\n");
    customFunction1(n);
}

int main() {
    customFunction1(10);

    return 0;
}