Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    char* temp = str;
    char var;
    
    while(*str != '\0'){
      str++;
    }
    str--;
    
    while(str > temp){
        var = *temp;
        *temp = *str;
        *str = var;
        temp++;
        str--;
    }

}

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;
}

Solving Approach