Solidity StringUtils: String manipulation library for Solidity

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "github.com/Arachnid/solidity-stringutils/strings.sol";

contract StringProcessor {
    using strings for *;
    
    function splitDomain(string memory url) public pure returns (string[] memory) {
        strings.slice memory s = url.toSlice();
        strings.slice memory delim = ".".toSlice();
        
        // Count parts to allocate array
        string[] memory parts = new string[](s.count(delim) + 1);
        
        // Split and store each part
        for(uint i = 0; i < parts.length; i++) {
            parts[i] = s.split(delim).toString();
        }
        
        return parts;
    }
    
    function getFileExtension(string memory filename) public pure returns (string memory) {
        strings.slice memory s = filename.toSlice();
        strings.slice memory dot = ".".toSlice();
        
        if (s.count(dot) == 0) {
            return "";
        }
        
        // Find last occurrence and get extension
        s.rfind(dot);
        return s.beyond(dot).toString();
    }
}