Function read_file 
Source pub fn read_file<P>(path: P) -> Result<String, Error>
Expand description
Reads the given file and returns its contents as a string.
§Parameters
path - A PathBuf or string slice containing the path to the file to be read. 
§Return
A Result containing the contents of the file as a string if the file is readable, or an
std::io::Error otherwise.