fix: Directories are shown even if they don’t contain files with the specified extension - #23

Process completed with exit code 1.

cannot use found (variable of type bool) as error value in return statement: bool does not implement error (missing method Error)

cannot use false (constant of type bool) as error value in return statement: bool does not implement error (missing method Error)

cannot use false (constant of type bool) as error value in return statement: bool does not implement error (missing method Error)

cannot use func(currentDir string, prefix string, depth int) error {…} (value of type func(currentDir string, prefix string, depth int) error) as func(string, string, int) bool value in assignment