Keep Only the Highest Set Bit

Code

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

// Complete the function

uint16_t highest_set_bit(uint16_t reg)
 {
    int z = 0;
    for (int i = 15 ; i>= 0; i--)
    {   
        int mask = 1 << i;
        z++;
        if (mask&reg)
        {   
            int dif = 16-z;
            int mask1 = 1<<dif;
            reg = reg & mask1;
        }
    }
    return reg;
}

int main() {
    uint16_t reg;
    scanf("%hu", &reg);

    uint16_t result = highest_set_bit(reg);
    printf("%hu", result);
    return 0;
}

Solving Approach