Convert Decimal Number to Binary or Hex Without itoa function

Code

#include <stdio.h>
#include <stdint.h>

void print_base(uint16_t num, uint8_t base) {
    // Your logic here
    
        if(num == 0) {
            printf("0"); 
            return;
        } //If input is 0

        char dig[17] = "0123456789ABCDEF";
        char buffer[20];
        int i = 0;

        while(num > 0){
            buffer[i++] = dig[num % base];
            num /= base;
        }

        for(int j = i-1; j>= 0; j--){
            putchar(buffer[j]);
        }

    }

int main() {
    uint16_t num;
    uint8_t base;
    scanf("%hu %hhu", &num, &base);

    print_base(num, base);
    return 0;
}

Solving Approach