98. Convert String to Integer

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

int custom_atoi(const char *str) {
    // Your logic here
    int retval = 0;
    int i = 0;
    int sign =0;
    if(str[0] == '-') {sign = 1; i++;}
    if(str[0] == '+') {i++;}
    while(str[i] != '\0')
    {
        if((str[i] >= '0' && str[i] <= '9'))
        {
            retval  = retval * 10 + (str[i] - '0'); 
            i++; 
        }
        else{break;}
    }
    return sign?-retval:retval;
}

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;
}