Convert a String to Float

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

float custom_atof(const char *str) {
    // Your logic here
    bool neg_falg = false;

    //detect optional sign
    if(*str=='-'){
        neg_falg = true;
        str++;
    }
    else if(*str=='+'){
        str++;
    }

    //first detect integer part then fractional
    bool fract_detect_flag = false;

    float int_num =0;
    float fract_num =0;
    float fract_den =1;

    while(*str!='\0'){

        if(*str=='.'){
            if(fract_detect_flag){
                // TODO: handle double dots!
                printf("Error: double dots!");
                return 0.0;
            }
            fract_detect_flag = true;
            str++;
        }
        if((*str>='0')&&(*str<='9')){
                
            if (fract_detect_flag){
                //parsing fractional part
                fract_num = fract_num*10 + *str - '0';
                fract_den = fract_den*10;
            }
            else{
                // parsing integer part
                int_num = int_num*10 + *str - '0';
            }
        }
        else{
            break;
        }

        str++;
    }


   float ret_val_f = int_num + fract_num/fract_den;
   if(neg_falg){ ret_val_f = -ret_val_f; }

   return ret_val_f;


}

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;
}