Function gerund 

pub fn gerund(verb: &VerbEntry) -> String

Computes the gerund (present participle) form of a verb.

Returns the irregular form if one is defined in the verb’s forms map under the "gerund" key. Otherwise, applies English gerund formation rules:

• Ends in -e (but not -ee) → drop e and append -ing (“make” → “making”)
• Ends in -ee → append -ing without dropping (“see” → “seeing”)
• Default → append -ing (“run” → “running”)

Note: This implementation does not handle consonant doubling (e.g., “run” → “running” should double the ‘n’, but this produces “runing”). For accurate results with such verbs, provide an irregular form in the forms map.

Arguments

• verb - The verb entry containing the lemma and optional irregular forms.

Examples

use logicaffeine_lexicon::runtime::{VerbEntry, gerund};
use std::collections::HashMap;

let make = VerbEntry {
    lemma: "make".to_string(),
    class: "Activity".to_string(),
    forms: HashMap::new(),
    features: vec![],
};
assert_eq!(gerund(&make), "making");

let see = VerbEntry {
    lemma: "see".to_string(),
    class: "Activity".to_string(),
    forms: HashMap::new(),
    features: vec![],
};
assert_eq!(gerund(&see), "seeing");