Reverse a String In-Place

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    int cnt = 0;
    char* t_str = str;
    while (*t_str != '\0')
    {
        cnt++;
        t_str++;
    }

    for (int i=0;i<(cnt/2);i++)
    {
        char temp = str[i];
        str[i] = str[cnt - i - 1];
        str[cnt - i - 1] = temp;        
    }
}

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;
}