How do I fix my code, so it passes all of the test in the test method

Number 1)****************************test method******************************************

public void testIsValidWord() { assertFalse(Hangman.isValidWord("Cool"));//false because only 4 letters assertTrue(Hangman.isValidWord("anxiety")); assertFalse(Hangman.isValidWord("aapaple"));//false because there are 3 As assertFalse(Hangman.isValidWord("renovate the room"));//fall because there are spaces }

*************************************************************************

my code

*************************************************************8

public static boolean validW(String word) {

int alphOccur=0;

boolean flag=true;

for(int i=0;i

if(word.charAt(i)>='a'&&word.charAt(i+1)<='z'||word.charAt(i)>='A'&&word.charAt(i+1)<='Z') {

flag = true;

}

if(alphOccur+1 >=3) {

flag=false;

}

for(int j=i+1;j

if(word.charAt(i)==word.charAt(j)) {

alphOccur++;

}

}

}

if(word.length()>=6) {

flag=true;

}

System.out.println(flag);

return flag;

}

--------------Number 2---------------------------------------------------------------------------------------------------------

//how do i

//test method

public void testMakeGuess() { assertEquals("optio_", Hangman.makeGuess("g", "option", "optio_")); assertEquals("option", Hangman.makeGuess("n", "option", "optio_")); assertEquals("opt___", Hangman.makeGuess("opt", "option", "______")); assertEquals("_p_ion", Hangman.makeGuess("ion", "option", "_p____")); assertEquals("option", Hangman.makeGuess("pt", "option", "op_ion")); }

//my code

/*the disguisedWord is the blank string with underscores like _ _ _ _ _ _ _, everytime a user guess a letter, if the letter is in the secretWord, it it assign the letter at the spot of the word in the blank space, like the test method.

*/

public static String mGuess(String guess, String secretWord, String disguisedWord) {

String newWord=disguisedWord;

if(secretWord.contains(guess)) {

for(int i=0;i

if(secretWord.charAt(i)==guess) {

newWord.charAt(i)=guess;

}

}

}

else {

newWord=disguisedWord;

}

return newWord;