Rust is skipping over for loop [closed] - for-loop

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I am fairly new to rust and am just trying to make a hangman game to help me learn the language. I have made a for loop that checks to see if the character I entered is in a vector of all the past characters I have guessed. But when running through it just keeps asking for the letter again, after going through the debugger it juts completely skips over the for loop completely.
I am using vscode with lldb to debug.
Can anyone lend a hand to either explain to me or help me work out why it isn't working.
use rand::random;
fn take_input(pre_guessed: &mut std::vec::Vec<char>) -> char{
let mut run = true;
print!("Enter letter: ");
let mut temp_guess = String::new();
let guess_char = match std::io::stdin().read_line(&mut temp_guess){
Ok(_) => temp_guess.chars().next().expect("Could not convert guess to char"),
Err(_) => '>'
};
println!();
for i in pre_guessed.iter(){ // THIS IS THE FOR LOOP THAT IS SKIPPED OVER
if *i == guess_char{
run = false;
}
}
if run == false{
pre_guessed.push(guess_char);
guess_char
} else {
take_input(pre_guessed)
}
}
fn get_word() -> String {
// goes to a text file and gets a word
}
fn check_correct(guessed_vec: &std::vec::Vec<char>) -> bool{
let mut complete = true;
for i in guessed_vec.iter(){
if *i == '-'{
complete = false;
}
}
complete
}
fn main() {
let word_to_guess = get_word();
println!("{}", word_to_guess);
let mut encoded_word = vec!['-'; word_to_guess.len()];
let mut guessed = false;
let mut guessed_letters: std::vec::Vec<char> = Vec::new();
let mut wrong_letters: std::vec::Vec<char> = Vec::new();
while guessed == false{
println!("Guessed letters: {:?}", wrong_letters);
for i in encoded_word.iter(){
print!("{}", i);
}
println!();
let guess = take_input(&mut guessed_letters);
let mut temp_count = 0;
let mut temp_match = false;
for i in word_to_guess.chars(){
if guess == i{
encoded_word[temp_count] = i;
temp_match = true
}
temp_count += 1;
}
if temp_match == false{
wrong_letters.push(guess);
}
guessed = check_correct(&guessed_letters)
}
}

Answer 1

guessed_letters starts empty.
The only thing that adds to it is pre_guessed.push(guess_char) when run == false.
run starts true.
The only thing that sets it to false is when *i == guess_char for any element i of pre_guessed (which is guessed_letters).
guessed_letters can only become nonempty when run is false, and run can only become false when guessed_letters is nonempty.
It looks like you meant:
if run { // no == false
pre_guessed.push(guess_char);
guess_char
} else {
take_input(pre_guessed)
}