Convert String to Integer

Code

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

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

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