Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    int i = 0;
    int sign = 1;
    int result = 0;
    while(str[i]!='\0'){
        if((str[i] >= '0' && str[i] <= '9')){
            
            result = result * 10 + (str[i]-'0');
        }
        else if(str[i]=='+' || str[i]=='-'){
            if(str[i]=='-')
                sign = -1;

        }
        else
            break;
        i++;
    }
    return result * 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