Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    int sign = 1;
    if(*str == '-'){
        sign = -1;
        str++;
    }else if(*str == '+'){
        sign = 1;
        str++;
    }

    float value = 0;
    float digit = 0;
    int decimal = 0;
    while(*str != '\0'){
        if(*str == '.'){
            decimal=10;
            str++;
        }
        digit = 0;
        if(!decimal){
            value *= 10;
            digit = (int)(*str - '0');
            value+=digit;
        }else if(decimal){
            digit = (int)(*str - '0');
            value += digit/(decimal);
            decimal*=10;
        }

        str++;
    }


    return value * 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;
}

Solving Approach