char *getline(char *input) {
    char *out;
    char prev;
    
    int i, len = strlen(input) + 1;
    
    for(i = 0; i < len; ++i) {
        prev = input[i];
        
        if(prev == '\n' || prev == '\r' || prev == '\0') {
            input[i] = '\0';
            out = strdup(input);
            input[i] = prev;
            return out;
        }
    }
    
    return NULL;
}