Challenge: Build a Solana Account Struct

Apply what you've learned about Rust ownership, structs, and methods. You'll create a SolanaAccount struct that models an on-chain account with balance management.

Your Task

Complete the SolanaAccount struct and its methods, then implement create_and_withdraw which:

1. Creates a new SolanaAccount using SolanaAccount::new(owner, initial_balance)
2. Attempts to withdraw withdraw_amount
3. Returns a String describing the result

Requirements:

• new() creates an account that is not frozen by default
• withdraw() returns Err("Account is frozen") if the account is frozen
• withdraw() returns Err("Insufficient balance") if amount > balance
• withdraw() subtracts the amount and returns Ok(remaining_balance)
• create_and_withdraw formats the result as "OK:<remaining>" or "ERR:<message>"

Rust Concepts Used:

• Structs with impl blocks
• Result<T, E> return type
• Pattern matching with match
• String formatting with format!()