How to change the state mutability of a function in solidity?

Question

I'm a newbie in solidity coding, so please forgive me for my ignorance.

I'm trying to create a token based on openzeppline and while using the HasNoTokens.sol contract, I'm receiving the following warning in remix:

browser/mytoken.sol:446:3: Warning: Function state mutability can be restricted to pure. function tokenFallback(address from_, uint256 value_, bytes data_) external {^Spanning multiple lines.

I reckon I've to change the way tokenFallback() function behaves. I'd greatful if someone could explain what is wrong here and how to fix this.

Answer 1

It is just telling you that you can use the modifier pure which basically means it is a function that only uses and modifies its arguments, and not any other value from the state of the contract.

See this link