Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    char sign;
    int num=0;
    int index=0;
    char ch=str[index];
    if(ch=='-' || ch=='+'){
        index++;
        sign=ch;
    }

    while(str[index]!='\0')
    {
        if(str[index]>='0' && str[index]<='9'){
            num=(num*10)+(str[index]-'0');
        }
        else if(str[index]=='-') index=index;
        else break;
        index++;
    }
    if(sign=='-') return -num;
    return num;
}

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