Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    bool neg = false; 
    int start = 0;
    if(str[0] == '-')
        neg = true;
    if(str[0] == '-' || str[0] == '+')
        start = 1; 

    int result = 0;
    for (int i = start; str[i] >= '0' && str[i] <= '9'; i++)
    {
        result = result*10 + (str[i] - '0');
    }
    return neg ? 0-result : result;
}

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