Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int i=0,res=0;
    bool neg = false;
    if(*str == '-'){
        neg = true;
        i++;
    }
    else if(*str == '+'){
        i++;
    }
    
    
    while(*(str+i)!='\0'){
        if(*(str+i)>='0' && *(str+i)<='9'){
            res=(res*10)+(*(str+i)-'0');
        }
        else{
            break;
        }
        i++;
    }
    return (neg)?-res:res;
}

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