Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    int8_t number = 0;
    int8_t sign = 1;

    while(((*str >= '0') && (*str <= '9')) || (*str == '-') || (*str == '+')){
            if(*str == '-'){
                sign = -1;
            }
            else if(*str == '+'){
              ; 
            }
            else{
                number = number * 10 + (*str - '0');
            }
            str++;
    }

    if(number > 0){
        return  sign * number;
    }
    else{
        return 0;
    }
    
}

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