fn all_slices(a: &str) -> impl Iterator<Item = &str>Expand description
Generates an iterator over all possible slices of the input string.
This function takes a string slice as input and creates an iterator that yields each possible substring of the input string.
It uses a range from 0 to the length of the string to initiate the starting index of each slice.
For each starting index, it employs flat_map combined with char_indices and skip to navigate through the string, creating substrings from each starting index to each subsequent character index.
The resulting iterator efficiently covers all contiguous substrings in the original string, ensuring comprehensive slice generation without allocating additional string storage.