Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here

    uint8_t index = 0;
    int sign = 1;
    uint8_t point_detected = 0;
    uint8_t re_num = 0;
    uint8_t im_num = 0;
    uint8_t prd = 1;

    while(*(str + index) != '\0')
    {
        if(*(str + index) == '-')
        {
            sign = -1;
        }
        else if(*(str + index) == '+')
        {
            sign = 1;
        }
        else if(*(str + index) == '.')
        {
            point_detected = 1;
        }
        else 
        {
            if(!point_detected)
            {
                re_num = re_num * 10 + (*(str + index) - '0');
            }
            else
            {
                im_num = im_num * 10 + (*(str + index) - '0');
                prd *= 10;
            } 
        }

        index += 1;
    }

    float myNum = (re_num + ((float)im_num / prd)) * sign;

    return myNum;
}

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