Convert String to Integer

Code

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

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

    while(*str != '\0'){
        if(*str == '+') {str++; continue;}
        if(*str == '-') {sign = -1; str++; continue;}
        if(*str < '0' || *str > '9') {break;}

        num = num * 10 + (*str - '0');
        str++;
    }
    return (num * sign);
}

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