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feat: add rust solution to lc problem: No.0058.Length of Last Word

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Original file line number	Diff line number	Diff line change
`@@ -85,6 +85,25 @@ class Solution {`
`85`	`85`	`}`
`86`	`86`	```
`87`	`87`
	`88`	`+### Rust`
	`89`	`+`
	`90`	+```rust
	`91`	`+impl Solution {`
	`92`	`+ pub fn length_of_last_word(s: String) -> i32 {`
	`93`	`+ let s = s.trim_end();`
	`94`	`+ if s.len() == 0 {`
	`95`	`+ return 0;`
	`96`	`+ }`
	`97`	`+ for (i, c) in s.char_indices().rev() {`
	`98`	`+ if c == ' ' {`
	`99`	`+ return (s.len() - i - 1) as i32;`
	`100`	`+ }`
	`101`	`+ }`
	`102`	`+ s.len() as i32`
	`103`	`+ }`
	`104`	`+}`
	`105`	+```
	`106`	`+`
`88`	`107`	`### ...`
`89`	`108`
`90`	`109`	```

Lines changed: 14 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,14 @@`
	`1`	`+impl Solution {`
	`2`	`+ pub fn length_of_last_word(s: String) -> i32 {`
	`3`	`+ let s = s.trim_end();`
	`4`	`+ if s.len() == 0 {`
	`5`	`+ return 0;`
	`6`	`+ }`
	`7`	`+ for (i, c) in s.char_indices().rev() {`
	`8`	`+ if c == ' ' {`
	`9`	`+ return (s.len() - i - 1) as i32;`
	`10`	`+ }`
	`11`	`+ }`
	`12`	`+ s.len() as i32`
	`13`	`+ }`
	`14`	`+}`

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