<p>You are given a string <code>sentence</code> that consist of words separated by spaces. Each word consists of lowercase and uppercase letters only.</p>
<p>We would like to convert the sentence to "Goat Latin" (a made-up language similar to Pig Latin.) The rules of Goat Latin are as follows:</p>
<ul>
<li>If a word begins with a vowel (<code>'a'</code>, <code>'e'</code>, <code>'i'</code>, <code>'o'</code>, or <code>'u'</code>), append <code>"ma"</code> to the end of the word.
<ul>
<li>For example, the word <code>"apple"</code> becomes <code>"applema"</code>.</li>
</ul>
</li>
<li>If a word begins with a consonant (i.e., not a vowel), remove the first letter and append it to the end, then add <code>"ma"</code>.
<ul>
<li>For example, the word <code>"goat"</code> becomes <code>"oatgma"</code>.</li>
</ul>
</li>
<li>Add one letter <code>'a'</code> to the end of each word per its word index in the sentence, starting with <code>1</code>.
<ul>
<li>For example, the first word gets <code>"a"</code> added to the end, the second word gets <code>"aa"</code> added to the end, and so on.</li>
</ul>
</li>
</ul>
<p>Return<em> the final sentence representing the conversion from sentence to Goat Latin</em>.</p>