Fix typo: duplicated the

ohbarye · ohbarye · commit fca2ab2ebf0f · 2019-12-26T23:39:15.000+09:00
diff --git a/_parts/part4.md b/_parts/part4.md
@@ -219,7 +219,7 @@ I'm going to use [strtok()](http://www.cplusplus.com/reference/cstring/strtok/)
    }
 ```
 
-Calling `strtok` successively on the the input buffer breaks it into substrings by inserting a null character whenever it reaches a delimiter (space, in our case). It returns a pointer to the start of the substring.
+Calling `strtok` successively on the input buffer breaks it into substrings by inserting a null character whenever it reaches a delimiter (space, in our case). It returns a pointer to the start of the substring.
 
 We can call [strlen()](http://www.cplusplus.com/reference/cstring/strlen/) on each text value to see if it's too long.
 

Original file line number	Diff line number	Diff line change
`@@ -219,7 +219,7 @@ I'm going to use [strtok()](http://www.cplusplus.com/reference/cstring/strtok/)`
`219`	`219`	`}`
`220`	`220`	```
`221`	`221`
`222`		-Calling `strtok` successively on the the input buffer breaks it into substrings by inserting a null character whenever it reaches a delimiter (space, in our case). It returns a pointer to the start of the substring.
	`222`	+Calling `strtok` successively on the input buffer breaks it into substrings by inserting a null character whenever it reaches a delimiter (space, in our case). It returns a pointer to the start of the substring.
`223`	`223`
`224`	`224`	`We can call [strlen()](http://www.cplusplus.com/reference/cstring/strlen/) on each text value to see if it's too long.`
`225`	`225`