Reverse a String In-Place

#include <stdio.h>
void swap(char *a,char *b){
    char temp = *a;
    *a = *b;
    *b = temp;
}
void reverse_string(char *str) {
    // Your logic here
    char *p = str;
    while(*p!='\0'){
        p++;
    }
    p--;
    while(str < p){
        swap(str++,p--);
    }
}

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;
}