Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int len;
    for(len=0;str[len]!='\0';len++);

    int i=0,j=0;

    if(str[i] == '-' || (str[i] >= '1' && str[i] <='9')) j=j;
    else j++;

    int sum=0;

    for(i=j;i<len;i++){

        if(str[i] == '-')printf("-");

        else if((str[i] >= '1' && str[i]<= '9') ){
            
            char temp;
           
            sum = sum*10;
            temp = str[i] - '0';
            sum += temp;


        }

        else break;

    }

    return sum;
    return 0;
}

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++;
    }

    printf("%d", custom_atoi(str));
    return 0;
}

Solving Approach