Convert a String to Float

Code

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

float custom_atof(const char *str) {
    int sign_f = 1;
    if(*str == '+') sign_f = 1, ++str;
    if(*str == '-') sign_f = -1, ++str;
    int num = 0;
    int nnum = 0;
    while (*str != '.' && *str)
    {
        num = num * 10 + *str - '0';
        ++str;
    }
    ++str;
    int count = 1;
    while (*str)
    {
        nnum = nnum * 10 + *str - '0';
        ++str;
        count *= 10;
        
    }
    
    return sign_f * ((float)num + (float)nnum/(count));
}

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