truffle deploy error

[leopchain2019]

PS F:\Github\leo\MetaCoin> truffle deploy --network ropsten

Compiling your contracts...
===========================
> Compiling .\contracts\HelloWorld.sol
> Compiling .\contracts\Migrations.sol

project:/contracts/HelloWorld.sol:5:45: TypeError: Data location must be "memory" for return parameter in function, but none was given.
    function sayHello() public pure returns(string){
                                            ^----^

Compilation failed. See above.
Truffle v5.4.11 (core: 5.4.11)
Node v12.18.2

[leopchain2019]

• Fixed

  contract HelloWorld {
  function sayHello() public pure returns(string memory){
      return("hello world");
  }
  }