Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int num = 0;
    int fl = 1;
    if(*str == '-') fl = -1, ++str;
    else if(*str == '+') fl = 1, ++str;
    else if(*str < '0' && *str > '9') return 0;
    
    // printf("%c\n", *str);
    while(*str){
        if(*str >= '0' && *str <= '9'){
            num  = num *10 + (*str - '0');
        }
        else break;
        ++str;
    }

    
    return num * fl;
}

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