Convert a String to Float

Code

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

float custom_atof(const char *str) {
    float number = 0.0f;
    float frac = 0.0f;
    int sign = 1;
    int divisor = 1;
    
    if(*str == '-'){
        sign = -1;
        str++;
    }
    else if(*str == '+'){
      str++;
    }
    
    
    while(*str != '\0' && *str != '.'){
        number = (number * 10.0f) + (*str - '0'); 
        str++;
    }
    
    if(*str == '.'){
      str++;
      
      while(*str != '\0'){
        frac = frac * 10.0f + (*str - '0');
        divisor *= 10;
        str++;  
      }
      
      number = number + (frac/divisor);
    }
    
    return sign * number;
    
}

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