Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int i=0,num=0,sign=1;
    while (str[i]!='\0'){
       if (i==0 && ((str[i]=='-')||(str[i]=='+'))){
        if(str[i]=='-') sign=-1;}
       else if (str[i]>='0' && str[i]<='9'){
        num=(num*10)+str[i]-'0';
       
       }
       else break;
       i++;
    }
    return num*sign;
}

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