Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int sign = 1;
    int str_indx = 0;
    if(!isdigit(str[0]))
    {
        sign = sign * (str[0] == '-' ? -1 : 1);
        str_indx++;
    }

    int num = 0;

    while(isdigit(str[str_indx]))
    {
        num = num * 10 + (str[str_indx] - '0');
        str_indx++;
    }

    return sign*num;

    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