100. Convert a String to Float

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

float custom_atof(const char *str) {
    // Your logic here
    uint8_t i = 0;
    uint8_t in_fraction = 0;
    int sign = 1;
    float result=0.0f;
    float fraction = 0.0f;
    float divisor = 10.0f;

    if(str[i]=='-'){
        sign=-1;
        i++;
    }else if(str[i]=='+'){
        i++;
    }
    while(str[i]!='\0'){
        if(str[i]=='.'){
        in_fraction = 1;
        i++;
        continue;
        }
    
        if(str[i]>='0'&&str[i]<='9'){
            int digit = str[i] - '0';
            if(!in_fraction){
            result = result * 10.0f + digit;
        }else{
            fraction += digit/divisor;
            divisor *= 10.0f;
        }
        }else{
            break;
        }
        i++;
    }
    return sign * (result+fraction);
}

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;
}