Problem :Write a function to find square root of a number
/*
Steps:
Use binary search to find the square root.
1. Initialize, start = 0, end = number, mid = (start+end)/2.
2. Set prevMid = 0, as the previous mid value.
3. Find diff = absolute difference between prevMid and mid.
4. While mid is not the square root of number (i.e. mid*mid != number) and difference diff is greater than 0.0005,
repeat the following steps:
a. If mid*mid > number, then the square root will be less than mid. So, set end = mid.
b. Else, the square root will be greater than mid. So, set start = mid.
c. Set prevMid = mid
d. Re-evaluate mid = (start+end)/2.
e. Re-evaluate diff from prevMid and mid.
*/
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