Convert Hexadecimal String to Integer Without strtol or sscanf functions

Code

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

uint16_t hex_to_uint(const char *str) {
    // Your logic here
    uint16_t value=0;
    int digit;
    for(int i=0;str[i]!='\0';i++){
        if(str[i]>='0'&&str[i]<='9'){
            digit=str[i]-'0';
        }
        else if(str[i]>='A'&&str[i]<='F'){
            digit=str[i]-'A'+10;
        }
        else{
            digit=str[i]-'a'+10;
        }
        value=value*16+digit;
    }
    return value;
}

int main() {
    char hex[10];
    scanf("%s", hex);

    printf("%u", hex_to_uint(hex));
    return 0;
}

Solving Approach