Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    int i=0,len=0;
    char result[20];
    while(str[i] != '\0'){
       len+=1;
       i++;
    }
    int last=len;
    result[last]='\0';
    for (int j=0;j<len;j++){
        result[last-1] = str[j];
        last--;
    }
    
    printf("%s",result);
}

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);
    
    return 0;
}

Solving Approach