Cohort-Assignment 3

Write a read-only function that returns the non-repeating number from a list of numbers

Prototype:

// returns uint (define-read-only (get-non-repeating (numbers (list 10 uint)))

// your logic here )

Test Cases:

Input: (list u1 u2 u1 u4 u6 u4 u6 u9 u9) Output: u2 Input: (list u1 u3 u4 u7 u3 u5 u4 u7 u5) Output: u1

Note: There is only one non-repeating number in the list. All other numbers repeat exactly once at any position. Hint: Check out the XOR operator and its usage.

Reference:

https://docs.stacks.co/write-smart-contracts/language-functions#fold

Usage: (contract-call? .<contract-name> get-non-repeating (list u1…u10))

Write a read-only function that returns a string indicating whether a given number is even or odd

Prototype:

// returns “even” or “odd” (define-read-only (get-type (num uint))

// your logic here

)

Test Cases:

Input: u6 Output: “even” Input: u5 Output: “odd”

Note: You are not allowed to you if-else, asserts or any other branch/control-flow statements. Your function must be branchless.

Create a custom trait NFT that can only be minted once by each user/principal. Choose appropriate asset identifier for your NFT.

Note: Your trait must include the following essential functions like transfer, burn, mint, get-owner.

In a separate contract, create a public function “give-commission” that transfers STX to a certain principal. Call this contract function inside the transfer function of your NFT in Q#3

Note: Choose the commission principal and transfer amount of your choice.

Reference:

https://docs.stacks.co/docs/write-smart-contracts/clarity- language/language-functions#contract-call https://docs.stacks.co/docs/write-smart-contracts/clarity- language/language-functions#stx-transfer