LibraryConvertStringToUint.sol

library ConvertStringToUint {
	
	function stringToUint(string _amount) internal constant returns (uint result) {
        bytes memory b = bytes(_amount);
        uint i;
        uint counterBeforeDot;
        uint counterAfterDot;
        result = 0;
        uint totNum = b.length;
        totNum--;
        bool hasDot = false;
        
        for (i = 0; i < b.length; i++) {
            uint c = uint(b[i]);
            
            if (c >= 48 && c <= 57) {
                result = result * 10 + (c - 48);
                counterBeforeDot ++;
                totNum--;
            }
            
			if(c == 46){
			    hasDot = true;
				break;
			}
        }
        
        if(hasDot) {
            for (uint j = counterBeforeDot + 1; j < 18; j++) {
                uint m = uint(b[j]);
                
                if (m >= 48 && m <= 57) {
                    result = result * 10 + (m - 48);
                    counterAfterDot ++;
                    totNum--;
                }
                
                if(totNum == 0){
                    break;
                }
            }
        }
         if(counterAfterDot < 18){
             uint addNum = 18 - counterAfterDot;
             uint multuply = 10 ** addNum;
             return result = result * multuply;
         }
         
         return result;
	}
}