Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    float res = 0.0;
    int division = 0;
    int fraction = 1;
    bool isFraction = 0;
    uint8_t i = 0;
    while (str[i] != '\0'){
        if (str[i] == '.') {
            division = i;
            isFraction = 1;
        } else if (str[i] >= '0' && str[i] <= '9'){
            res = res * 10 + (str[i] - '0');
        }
        ++i;
    }

    if (isFraction){
        for (int j = 1; j < (i - division); ++j){
            fraction = fraction * 10;
        }
    }
    return str[0] == '-' ? (-res / fraction) : (res / fraction);
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    float value = custom_atof(str);
    printf("%.2f", value);
    return 0;
}

Solving Approach