Implement Manual String Reversal Function with Comprehensive Testing

[laura-abro]

Implement Manual String Reversal Function with Comprehensive Testing

Description

Task

Implement String Reversal Function

Acceptance Criteria

• Function should take a string input and return its reverse
• Should handle empty strings
• Should preserve spaces and special characters
• Should be implemented without using string[::-1] or reverse()

Summary of Work

Overview

This pull request implements a custom string reversal function that manually reverses a string without using built-in methods like [::-1] or reverse().

Changes Made

• Created reverse_string() function in src/string_reversal.py
• Implemented a two-pointer manual string reversal algorithm
• Added comprehensive test suite in tests/test_string_reversal.py

Implementation Details

Function Implementation

• Uses a two-pointer technique to reverse the string
• Converts string to a list of characters
• Swaps characters from both ends moving towards the center
• Preserves all characters, including spaces and special characters
• Includes type checking to ensure only string inputs are accepted

Key Implementation Features

• Manual reversal without built-in methods
• O(n) time complexity
• O(n) space complexity
• Handles various input scenarios

Acceptance Criteria

✅ Takes a string input
✅ Returns the reversed string
✅ Preserves spaces and special characters
✅ Implemented without using [::-1] or reverse()
✅ Includes robust error handling
✅ Comprehensive test coverage

Testing Approach

• Created 7 test cases covering:
  1. Basic string reversal
  2. Empty string
  3. Single character
  4. Strings with spaces
  5. Strings with special characters
  6. Mixed character strings
  7. Invalid input handling

Test Results

• All 7 test cases passed successfully
• 100% test coverage
• Verified correct string reversal for various input types

Considerations

• The implementation uses additional space to convert to a list
• Linear time complexity ensures efficient performance for most use cases

Changes Made

• Created manual string reversal implementation in src/string_reversal.py
• Used two-pointer technique to reverse string
• Added type checking for input validation
• Implemented comprehensive test cases in tests/test_string_reversal.py

Tests

• Test basic string reversal
• Test empty string reversal
• Test single character reversal
• Test string with spaces
• Test string with special characters
• Test mixed character string
• Test invalid input handling

Signatures

Staking Key

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Public Key

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