Function itoa

stdlib/c/stdio.c:15–48

#define TO_DIGIT(n) ((n) + '0')

void itoa(int num, char *str) {
    int i = 0;
    int isNegative = 0;

    if (num == 0) {
        str[i++] = '0';
        str[i] = '\0';
        return;
    }

    if (num < 0) {
        isNegative = 1;
        num = -num;
    }

    while (num != 0) {
        int rem = num % 10;
        str[i++] = TO_DIGIT(rem); // Use macro
        num = num / 10;
    }

    if (isNegative) {
        str[i++] = '-';
    }

    // Reverse the string (could be optimized)
    for (int start = 0, end = i - 1; start < end; start++, end--) {
        char temp = str[start];
        str[start] = str[end];
        str[end] = temp;
    }

    str[i] = '\0';
}

// This function is almost identical to itoa. 
// Consider refactoring to avoid code duplication