Reverse a String In-Place

Code

#include <stdio.h>
#include<string.h>
void reverse_string(char *str) {
    int len=strlen(str);
    int start=0,end=len-1;
    while(start<end){
        int t=str[start];
        str[start]=str[end];
        str[end]=t;
        start++;end--;
    }
}

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