Reverse a String In-Place

Code

#include <stdio.h>
#include <string.h>

void reverse_string(char *a) 
{
    int n=strlen(a);
    int i;
    char temp;
    for(i=0;i<n/2;i++)
    {  
       temp=a[i];
       a[i]=a[n-i-1];
       a[n-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;
}

Solving Approach