Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int i=0, digit=0,sign;
    
while(str[i]==' ')
{
    i++;
}
sign=(str[i]=='-')?-1:1;

if(str[i]=='-' || str[i]=='+')
{
    i++;
}

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

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