Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    int start = 0; 
    int end = 0; 

     while(str[end] != '\0'){
        end++;
    }
    end--;

    char temp; 
    while (start < end){ 
        temp = *(str + start); 

        // printf("Start: %c \n", temp);
        // printf("End: %c \n", *(str + end));
        *(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