Reverse a String In-Place

Code

#include <stdio.h>

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

    for (int i = 0; i < len/2; ++i) {
        char c = *(str + i);
        *(str + i) = *(str+len - i-1);
        *(str+len - i-1) = c;
    }
}

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