Reverse a String In-Place

#include <stdio.h>

int my_strlen(char *str)
{
    int i = 0;
    while(*(str + i) != '\0')
    {
        i++;
    }

    return i;
}

void reverse_string(char *str) {
    int left = 0;
    int right = my_strlen(str) - 1;

    while(left < right)
    {
        char temp = *(str + left);
        *(str + left) = *(str + right);
        *(str + right) = temp;
        left++;
        right--;
    }
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    int i = 0;
    while (str[i] != '\0') {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    reverse_string(str);
    printf("%s", str);
    return 0;
}