text: Check if the current character of the string is a vowel and both the previous and the next characters are consonants , if so then this is a sandwiched vowel , thus is ignored and not appended to the updated string
code: if ( isVowel ( a [ i ] ) && ! isVowel ( a [ i - 1 ] ) && ! isVowel ( a [ i + 1 ] ) ) { continue ; }