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
    uint8_t index = 0;
    int8_t pos = -1;
    
    for(index;index<16;index++){
        if(reg&(1<<index))
            pos = index;
    }

    if(pos != -1)
      return (1<<pos);

    return 0;
}

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

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

Solving Approach