Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int num = 0;
    if(str[0] == '-')
    {
        int i=1;
        while(str[i]>= '0' && str[i]<='9')
        {
            num = num*10 - (str[i] - 48);
            i++;
        }
    }
    else 
    {
        int i= (str[0] == '+')?1 : 0;
        while(str[i]>='0' && str[i]<='9')
        {
            num = num*10 + (str[i] - 48);
            i++;
        }
    }
    return num;
}

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