100. Convert a String to Float

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

float custom_atof(const char *str) {
    int i=0;
    int sign=1;

    if(str[i] == '+'){
        i++;
    }else if(str[i] == '-'){
        i++;
        sign=-1;
    }

    float result = 0.0;

    while(str[i]>='0' && str[i]<='9'){
        result = result*10 + (str[i] - '0');
        i++;
    }

    if(str[i] == '.'){
        i++;
        float devisor=10.0;
        while(str[i]>='0' && str[i]<='9'){
            result += (str[i]-'0')/devisor;
            devisor*=10;
            i++;
        }
    }
    return result*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;
}