Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    if (str == 0)
        return 0.0f;
    float value=0.0f;
    int sign=1;
    if(*str=='+')
            str++;
    else if(*str=='-')
    {
        sign=-1;
        str++;
    }
            
    while(*str>='0'&&*str<='9')
    {
        value=(value*10.0f) + (float)(*str-'0');
        str++;

    }
    if(*str=='.')
    {
        str++;
        float place=0.1f;
        while(*str>='0'&&*str<='9')
    {
       value += (float)(*str - '0') * place;
            place *= 0.1f;
            str++;

    }
    }
    return (float)sign * value;
}

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