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added contributors, and contributors can transfer fund

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Original file line number	Diff line number	Diff line change
`@@ -15,5 +15,30 @@ contract CrowdFunding`
`15`	`15`	`{`
`16`	`16`	`goal = _goal;`
`17`	`17`	`deadline = block.timestamp + _deadline;`
	`18`	`+ minimumContribution = 100 wei;`
	`19`	`+ admin = msg.sender;`
	`20`	`+ }`
	`21`	`+`
	`22`	`+ function contribute() public payable`
	`23`	`+ {`
	`24`	`+ require(block.timestamp < deadline, "Deadline has passed");`
	`25`	`+ require(msg.value >= minimumContribution, "Minimum contribution not met");`
	`26`	`+ if(contributors[msg.sender] == 0)`
	`27`	`+ {`
	`28`	`+ numberOfContributors++;`
	`29`	`+ }`
	`30`	`+`
	`31`	`+ contributors[msg.sender] += msg.value;`
	`32`	`+ raisedAmount += msg.value;`
	`33`	`+ }`
	`34`	`+`
	`35`	`+ receive() external payable`
	`36`	`+ {`
	`37`	`+ contribute();`
	`38`	`+ }`
	`39`	`+`
	`40`	`+ function getBalance() public view returns(uint)`
	`41`	`+ {`
	`42`	`+ return address(this).balance;`
`18`	`43`	`}`
`19`	`44`	`}`

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