Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int num=0,flag = 1;
    if(*str == '-'){
        +str++;
        flag = 0;
    }
    else if(*str == '+'){
        *str++;
    }
    while(*str >= '0'  && *str <= '9'){
            num = num * 10 +(*str - '0');
            *str++;
    }
    if(flag) return num;
    else 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