I all ready used it!!

Im in the final touch up.
I cannot do the letter_used, says. U all ready used this letter!!
urghhh...i know its prob basic..but im going crazy w over 300 lines


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  void guess_letter (char word_player[], int word_size, char underscore[],char letter_used[], int guessed)
{    
	const int SIZE2 = 10;
    char guess[SIZE2]; 
    char LetterEntered,valid;
    int x;
       
    do{
        
		printf("Enter a guess letter: ");

        fgets(guess, word_size, stdin);
        LetterEntered = guess[0];
		LetterEntered = tolower(LetterEntered);
        //printf("got letter %c\n",LetterEntered);
        
        
        if(LetterEntered >= 'a' && LetterEntered <= 'z')
        {   
            valid = 'y';
            for (x=0; x < word_size; x++) 
			{
                if(word_player[x] == LetterEntered) 
                    underscore[x] = LetterEntered;
            } 
			printf("Now the word is %s\n",underscore);
            
			for (x=0; x < word_size; x++) 
			{
                if(word_player[x] != LetterEntered) 
                    letter_used[guessed] = LetterEntered;
            } 
			printf("Letters used %s\n",letter_used);
								
        }
        else
            printf("Enter a char.\n");
            
    }while(valid != 'y');
    return;
}
anyone pls..help!!
Could you please restate your problem as a clear question?

What are you trying to do, and what exactly is not working?
If the user all ready used the letter.
it should print a warning msg!!
thanks for looking
line 30
ive been doing the assigmnent for 50hrs +, its over 300 lines,
if was a real job I was fired lol
but I only been doing for 3 months
here its almost right!! OMG

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void guess_letter (char word_player[], int word_size, char underscore[],char letter_used[], int guessed)
{    
	const int SIZE2 = 10;
    char guess[SIZE2]; 
    char used[SIZE2] = {'\0'};
    char LetterEntered,valid;
    int x;
       
    do{
        
		printf("Enter a guess letter: ");
        fgets(guess, word_size, stdin);
        LetterEntered = guess[0];
		LetterEntered = tolower(LetterEntered);
        //printf("got letter %c\n",LetterEntered);
        
        
        if(LetterEntered >= 'a' && LetterEntered <= 'z')
        {   
            valid = 'y';
			
			for (x=0; x < word_size; x++) 
			{
                if(letter_used[x] == LetterEntered) 
                    letter_used[guessed] = LetterEntered;
            } 
			printf("you all ready used  %c\n",LetterEntered);	
			
			for (x=0; x < word_size; x++) 
			{
                if(word_player[x] == LetterEntered) 
                    underscore[x] = LetterEntered;
            } 
			printf("Now the word is %s\n",underscore);
            
			for (x=0; x < word_size; x++) 
			{
                if(word_player[x] != LetterEntered) 
                    letter_used[guessed] = LetterEntered;
                    used[guessed] = LetterEntered;
            } 
			printf("Letters used %s\n",letter_used);
								
        }
        else
            printf("Enter a char.\n");
            
    }while(valid != 'y');
    return;
}
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