First Word
You might see a simplified version of this mission already First Word (simplified). This mission is a little bit more complex as not only English letters can be in the given string.
You are given a string where you have to find its first word.
When solving a task pay attention to the following points:
- There can be dots and commas in a string.
- A string can start with a letter or, for example, one/multiple dot(s) or space(s).
- A word can contain an apostrophe and it's a part of a word.
- The whole text can be represented with one word and that's it.
Input: A string (str).
Output: A string (str).
Examples:
assert first_word("Hello world") == "Hello"
assert first_word(" a word ") == "a"
assert first_word("don't touch it") == "don't"
assert first_word("greetings, friends") == "greetings"
How it is used: the first word is a command in a command line
Precondition: the text can contain a-z A-Z , . '
