Convert a String to Float

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

float custom_atof(const char *str) {
    float num = 0;
    float fraction = 0.1;
    int flag = 1;

    if(*str == '-'){
        flag = -1;
        *str++;
    }
    else if (*str == '+'){
        flag = 1;
        *str++;
    }

    while (*str && *str != '.'){
        num = num*10 + (*str - '0');
        str++;
    }

    if(*str == '.'){
        str++;
        while(*str != '\0'){
            num = num + (*str - '0')*fraction;
            fraction /= 10;
            str++;
        }
    }
    return flag*num;
}

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;
}