Convert a String to Float

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

float custom_atof(const char *str) {
    // Your logic here
    float result = 0;
    float sign = 1;
    int i = 0;
    int afterPoint = 0;
    int decimalCount = 0;

    if(str[0] == '-'){
        sign = -1;
        i++;
    } else if (str[0] == '+'){
        i++;
    }
    
    while(str[i] != '\0'){
        if(str[i] >= '0' && str[i] <= '9'){
            int digit = str[i] - '0';
            if(afterPoint == 0){
                result = result * 10.0f + digit;
            } else if(decimalCount < 2){
                result = result + digit / (decimalCount == 0 ? 10.0f : 100.0f);
                decimalCount++;
            }
        } else if (str[i] == '.'){
            if (afterPoint)
                break;      // nhiều dấu chấm -> stop

            afterPoint = 1;
        } else {
            break;
        }
        i++;
    } 

    return result * sign;
}

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;
}