Reverse a String In-Place

Code

#include <stdio.h>

void swap(char* ch1, char* ch2)
{
    char temp = *ch1;
    *ch1 = *ch2;
    *ch2 = temp;
}

void reverse_string(char *str) {
    // Your logic here
    int end = 0;
    while(str[end] != '\0')
    {
        end++;
    }

    int i = 0;
    int j = end-1;

    while(i < j)
    {
        swap(str+i, str+j);
        i++;
        j--;
    }

}

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