100. Convert a String to Float

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

float custom_atof(const char *str) {
    // Your logic here
    int sign = 1;
    int i = 0;
    float result = 0.0f;
    float fraction = 1.0f;
    int dot_cf = 0;

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

    while(str[i] != '\0'){
        if(str[i] == '.'){
            dot_cf = 1;
            i++;
            continue;
        }

        if((str[i] >= '0' && str[i] <= '9')){
            if(dot_cf == 0){
                result = result * 10.0f + (str[i] -'0');
                }  
            else if(dot_cf == 1){
                fraction /= 10.0f;
                result = result + fraction * (str[i] - '0');
            }
        }  
        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;
}