You are given a string and you have to find its first word.
This is a simplified version of the First Word mission, which can be solved later.
- The input string consists of only English letters and spaces.
- There aren’t any spaces at the beginning and the end of the string.
Input: A string.
Output: A string.
first_word("Hello world") == "Hello"
How it is used: The first word is a command in a command line.
Precondition: The text can contain a-z, A-Z and spaces.