Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // Your logic here
    uint16_t tes = -1;
    int cnt = 0;
    while(tes & reg){
        tes = tes << 1;
        cnt++;
        // printf("%hu\n", tes);
    }
    reg = reg & (1 << (cnt-1));
    return reg;
}

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

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

Solving Approach