Convert a String to Float

Code

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

float custom_atof(const char *str) {
    // Your logic here
    int i;
    int x;
    int sum=0;
    float sum1=0;
    for(i=0;((str[i]!='.')&&(str[i]));i++){
        if((str[i]>='0')&&(str[i]<='9'))
        sum=sum*10+(str[i]-48); 
    }
    float f=0.1;
    for(i=i+1;str[i];i++,f=f*0.1){
        sum1=sum1+f*(str[i]-48);
    }
    if(str[0]=='-')
    return -(sum+sum1);
    else
    return (sum+sum1);

    return 0.0f;
}

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