Convert String to Integer

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

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