Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    int i = 0;
    int num = 0;
    int in_fraction = 0;
    int dec = 1;
    float frac = 0;
    int sign = 1;
    while (str[i] != '\0') {
        if (str[i] == '-') {
            sign = -1;
        }
        else if ('0' <= str[i] && str[i] <= '9') {
            if (!in_fraction) {
            num = num * 10 + str[i] - '0';
            }
            else {
                dec *= 10;
                frac += (float)(str[i] - '0') / dec;
            }
        }  
        else if (str[i] == '.') {
            in_fraction = 1;
        }
        i++;
    }

    return sign * (num + frac);
}

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