Reverse a String In-Place

Code

#include <stdio.h>

int len(char *str){
    int i=0;
    while(str[i] != '\0'){
        i++;
    }
    return i; 
}


void reverse_string(char *str) {
    // Your logic here
    int start=0; 
    int end = len(str) - 1; 
    while(start<end){
        char temp = str[start];
        str[start] = str[end];
        str[end] = temp;

        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