Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    int n=0;
    char* ptr = str;
    while(*ptr!='\0'){
        n++;
        ptr++;
    }
    for(int i=0,j=n-1;i<n/2;i++,j--){
        char temp = *(str+i);
        *(str+i) = *(str+j);
        *(str+j) = temp;
    }
    return;
}

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