Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    int start = 0;
    int end  = 0;
    while(str[end] != '\0'){ //Travers till we find the null char after last char
        end ++;
    }
    end--; //To point the end character & not null char

    while(start < end){
        char temp = str[start];
        str[start] = str[end];
        str[end] = temp; //Swap the characters wrt start and end pointers until pointers overlap each other
        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