Convert String to CamelCase

You are given a string s that may contain multiple words separated by spaces. Your task is to convert this string to camelCase format.

In camelCase, the first word is in lowercase, and every subsequent word has its first character in uppercase and the rest in lowercase. For example, the string "Hello World" becomes "helloWorld".

If the input string is empty or contains only whitespace, the output should be an empty string.

Note: When processing the string, extra spaces should be ignored.

inputFormat

The input consists of a single line containing a string s. The string may contain leading or trailing spaces and multiple spaces between words.

outputFormat

Output a single line containing the camelCase version of the input string.

hello

hello