Convert String to Integer

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

int custom_atoi(const char *str) {
    // Your logic here
    int i=0;
    int num=0;
    int sym =1;

   

    while(str[i] != '\0')
    {   
        if( str[i] =='-')
        {
            sym=-1;

        }
        else if(str[i] == '+');
        else if(str[i] >='0' && str[i] <='9') 
        {
             num = num* 10 + (str[i] - '0');
            
        }  
        else
        {
           
           break;
        }    

        i++;
    }
    
    return num*sym;
}

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;
}