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pub fn upper_cammel_case_to_sentence(src: String, remove_first: bool) -> String {
let mut letters: Vec<_> = vec![];
for c in src.chars() {
if c.is_uppercase() {
if !letters.is_empty() {
letters.push(' ');
}
if let Some(lowercase) = c.to_lowercase().to_string().chars().next() {
letters.push(lowercase);
}
} else {
letters.push(c);
}
}
let sentence: String = letters.into_iter().collect();
if remove_first {
let mut words: Vec<_> = sentence.split_whitespace().collect();
words.drain(0..1);
words.join(" ")
} else {
sentence
}
}
#[cfg(test)]
pub mod test {
use super::*;
#[test]
fn test_upper_cammel_case_to_sentence() {
assert_eq!(
upper_cammel_case_to_sentence("ThisIsATest".to_owned(), false),
"this is a test"
);
assert_eq!(
upper_cammel_case_to_sentence("ThisIsATest".to_owned(), true),
"is a test"
);
assert_eq!(
upper_cammel_case_to_sentence("TopicAlreadyExists".to_owned(), true),
"already exists"
);
assert_eq!(
upper_cammel_case_to_sentence("UnknownTopicOrPartition".to_owned(), false),
"unknown topic or partition"
);
}
}