Extract Bit Field from 16-bit Register

Simple

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

#define FIELD_MASK         0x1F
#define FIELD_POS          4U
#define EXTRACT_FIELD(x)   ((x>>FIELD_POS) & FIELD_MASK)
uint8_t extract_field(uint16_t reg) {
    // Your logic here
    return EXTRACT_FIELD(reg);
}

int main() {
    uint16_t reg;
    scanf("%hx", &reg);
    printf("%u", extract_field(reg));
    return 0;
}

Solving Approach