Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
 int i=0,sign=1,after_dot=0;
 float res=0,decimal=0.1;

    if(str[i] == '-')
    {
        sign = -1;
        i++;
    }
    else if (str[i] == '+') 
    {
        i++;
    }
    for(;str[i];i++)
    {
        if(str[i]>='0' && str[i]<='9')
        {
            if(after_dot==0)
            {
                res=res*10+(str[i]-'0');
            }
            else
            {
                res=res+((str[i]-'0')*decimal);
                decimal=decimal/10;
            }
        }
        else if(str[i]=='.')
        {
        after_dot=1;
        }
        else 
        break;
    }
     return sign*res;
}

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