Skip to content

Add solution for Challenge 2 by elecycele #794

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
RezaSi merged 1 commit into from
Nov 23, 2025
Merged

Add solution for Challenge 2 by elecycele #794

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
38 changes: 38 additions & 0 deletions challenge-2/submissions/elecycele/solution-template.go
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,38 @@
package main

import (
"bufio"
"fmt"
"os"
)

func main() {
// Read input from standard input
scanner := bufio.NewScanner(os.Stdin)
if scanner.Scan() {
input := scanner.Text()

// Call the ReverseString function
output := ReverseString(input)

// Print the result
fmt.Println(output)
}
}
Comment on lines +9 to +21
Copy link
Contributor

@coderabbitai coderabbitai bot Nov 23, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

⚠️ Potential issue | 🟡 Minor

Consider adding error handling for scanner.

The code doesn't check for scanner errors after Scan() returns. While this works for valid input, it silently ignores any I/O errors.

Apply this diff to add error handling:

 func main() {
 	// Read input from standard input
 	scanner := bufio.NewScanner(os.Stdin)
 	if scanner.Scan() {
 		input := scanner.Text()
 
 		// Call the ReverseString function
 		output := ReverseString(input)
 
 		// Print the result
 		fmt.Println(output)
 	}
+	if err := scanner.Err(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error reading input: %v\n", err)
+		os.Exit(1)
+	}
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
func main() {
// Read input from standard input
scanner := bufio.NewScanner(os.Stdin)
if scanner.Scan() {
input := scanner.Text()
// Call the ReverseString function
output := ReverseString(input)
// Print the result
fmt.Println(output)
}
}
func main() {
// Read input from standard input
scanner := bufio.NewScanner(os.Stdin)
if scanner.Scan() {
input := scanner.Text()
// Call the ReverseString function
output := ReverseString(input)
// Print the result
fmt.Println(output)
}
if err := scanner.Err(); err != nil {
fmt.Fprintf(os.Stderr, "Error reading input: %v\n", err)
os.Exit(1)
}
}
🤖 Prompt for AI Agents 
In challenge-2/submissions/elecycele/solution-template.go around lines 9 to 21,
the main function calls scanner.Scan() but does not check scanner.Err()
afterwards so I/O errors are silently ignored; after Scan() returns (and
before/after using input) call scanner.Err(), and if non-nil log or print the
error to stderr (e.g., fmt.Fprintln(os.Stderr,...)) and exit with a non-zero
status (os.Exit(1)) so the program fails fast on I/O errors instead of silently
continuing.


// ReverseString returns the reversed string of s.
func ReverseString(s string) string {
// TODO: Implement the function
Copy link
Contributor

@coderabbitai coderabbitai bot Nov 23, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

⚠️ Potential issue | 🟡 Minor

Remove the TODO comment.

The function is fully implemented, so the TODO comment should be removed.

Apply this diff:

-	// TODO: Implement the function
 	runes := []rune(s)
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
// TODO: Implement the function
runes := []rune(s)
🤖 Prompt for AI Agents 
In challenge-2/submissions/elecycele/solution-template.go around line 25, remove
the remaining "// TODO: Implement the function" comment because the function is
already implemented; simply delete that single-line TODO comment so the code no
longer contains stale task markers.

runes := []rune(s)
i := 0
j := len(s) -1
Copy link
Contributor

@coderabbitai coderabbitai bot Nov 23, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

⚠️ Potential issue | 🔴 Critical

Critical bug: Use len(runes) instead of len(s).

Line 28 uses len(s) which returns the byte length of the string, not the rune count. For multi-byte UTF-8 characters, this will cause an index out of bounds panic.

Example: The string "你好" has 6 bytes but only 2 runes. Using j := len(s) - 1 sets j = 5, but runes only has indices 0-1, causing a panic when accessing runes[5].

Apply this diff to fix the bug:

-	j := len(s) -1
+	j := len(runes) - 1
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
j := len(s) -1
j := len(runes) - 1
🤖 Prompt for AI Agents 
In challenge-2/submissions/elecycele/solution-template.go around line 28, the
code sets j := len(s) - 1 which uses byte length of the string and can panic for
multi-byte UTF-8 characters; change j to use the rune slice length (j :=
len(runes) - 1) so indexing matches the runes slice, ensuring all subsequent
accesses use rune indices rather than byte indices.



for i < j {
runes[i], runes[j] = runes[j], runes[i]

i++
j--
}
return string(runes)
}
Loading