Convert a String to Float

Code

#include <stdio.h>
#include <stdint.h>
float custom_atof(const char *str)
{
    int i = 0;
    float num = 0.0f;
    float dec = 0.0f;
    float sign = 1.0f;
    float divisor = 1.0f;
    if (str[i] == '-') 
    {
        sign = -1.0f;
        i++;
    }
    else if (str[i] == '+') 
    {
        i++;
    }
    while (str[i] >= '0' && str[i] <= '9') 
    {
        num = num * 10 + (str[i] - '0');
        i++;
    }
    if (str[i] == '.') 
    {
        i++; 

        while (str[i] >= '0' && str[i] <= '9') 
        {
            dec = dec * 10 + (str[i] - '0');
            divisor *= 10;     
            i++;
        }
    }
    return sign * (num + (dec / divisor));
}
int main()
{
    char str[101];
    fgets(str, sizeof(str), stdin);
    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