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add solution problem 709

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	`1`	`+#[709. To Lower Case][title]`
	`2`	`+`
	`3`	`+##Description`
	`4`	`+`
	`5`	`+Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.`
	`6`	`+`
	`7`	`+Example 1:`
	`8`	`+`
	`9`	+```
	`10`	`+Input: "Hello"`
	`11`	`+Output: "hello"`
	`12`	+```
	`13`	`+`
	`14`	`+`
	`15`	`+Example 2:`
	`16`	`+`
	`17`	+```
	`18`	`+Input: "LOVELY"`
	`19`	`+Output: "lovely"`
	`20`	+```
	`21`	`+`
	`22`	`+Example 3:`
	`23`	`+`
	`24`	+```
	`25`	`+Input: "here"`
	`26`	`+Output: "here"`
	`27`	+```
	`28`	`+`
	`29`	`+`
	`30`	`+`
	`31`	`+`
	`32`	`+`
	`33`	`+`
	`34`	`+`
	`35`	`+`
	`36`	`+`
	`37`	`+`
	`38`	`+[title]:https://leetcode.com/problems/to-lower-case/`
	`39`	`+`

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	`1`	`+package Solution`
	`2`	`+`
	`3`	`+import"strings"`
	`4`	`+`
	`5`	`+functoLowerCase(strstring)string {`
	`6`	`+returnstrings.ToLower(str)`
	`7`	`+}`

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	`1`	`+package Solution`
	`2`	`+`
	`3`	`+import (`
	`4`	`+"reflect"`
	`5`	`+"testing"`
	`6`	`+)`
	`7`	`+`
	`8`	`+funcTestSolution(t*testing.T) {`
	`9`	`+cases:= []struct {`
	`10`	`+namestring`
	`11`	`+inputstring`
	`12`	`+expectstring`
	`13`	`+}{`
	`14`	`+{"Test case 1","HELLO","hello"},`
	`15`	`+{"Test case 2","here","here"},`
	`16`	`+{"Test case 1","LOVELY","lovely"},`
	`17`	`+}`
	`18`	`+`
	`19`	`+for_,testcase:=rangecases {`
	`20`	`+t.Run(testcase.name,func(t*testing.T) {`
	`21`	`+got:=toLowerCase(testcase.input)`
	`22`	`+if!reflect.DeepEqual(got,testcase.expect) {`
	`23`	`+t.Fatalf("expected: %v, but got: %v, with input: %v ",testcase.expect,got,testcase.input)`
	`24`	`+}`
	`25`	`+})`
	`26`	`+}`
	`27`	`+}`

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