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24 lines
560 B
Rust
24 lines
560 B
Rust
use std::collections::HashMap;
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fn count_duplicates(text: &str) -> u32 {
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let mut counts: HashMap<char, i32> = HashMap::new();
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for character in text.to_lowercase().chars() {
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match counts.get_mut(&character) {
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None => {
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counts.insert(character, 1);
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{}
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},
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Some(x) => *x += 1
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}
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}
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counts
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.iter()
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.fold(0, |total, (_, &count)|
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match count > 1 {
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true => total + 1,
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_ => total
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}
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)
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}
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