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bundinha.sol

pragma solidity ^0.4.22;

import './Utils.sol';

contract bundinha is Utils {
	uint N;
	string bundinha;


	function setN(uint x) public {
		N = x;
	}

	function getN() constant public returns (uint) {
		return N;
	}

	function setBundinha(string x) public {
		require(strlen(x) <= 32);
		bundinha = x;
	}

	function getBundinha() constant public returns (string){
		return bundinha;
	}

}

Utils.sol

pragma solidity ^0.4.22;


contract Utils {
	function Utils() public {
	}

	// function compareStrings (string a, string b) view returns (bool){
	// 	return keccak256(a) == keccak256(b);
	// }

	// // verifies that an amount is greater than zero
	// modifier greaterThanZero(uint256 _amount) {
	//     require(_amount > 0);
	//     _;
	// }

	// validates an address - currently only checks that it isn't null
	modifier validAddress(address _address) {
	    require(_address != address(0));
	    _;
	}

	// verifies that the address is different than this contract address
	modifier notThis(address _address) {
	    require(_address != address(this));
	    _;
	}

	function strlen(string s) internal pure returns (uint) {
		// Starting here means the LSB will be the byte we care about
		uint ptr;
		uint end;
		assembly {
			ptr := add(s, 1)
			end := add(mload(s), ptr)
		}

		for (uint len = 0; ptr < end; len++) {
			uint8 b;
			assembly { b := and(mload(ptr), 0xFF) }
			if (b < 0x80) {
				ptr += 1;
			} else if(b < 0xE0) {
				ptr += 2;
			} else if(b < 0xF0) {
				ptr += 3;
			} else if(b < 0xF8) {
				ptr += 4;
			} else if(b < 0xFC) {
				ptr += 5;
			} else {
				ptr += 6;
			}
		}

		return len;
	}


}